In the US today there is a big divide between the treatment of people with "mental disorders" and "criminals", when in reality these two groups often have major overlap. This means developing a better understanding of what it takes to care for and institutionalize criminals as well as acknowledging the need for institutionalization of people with other kinds of needs. I think the latter is an area where China is well ahead of the US.
When I was in China, I toured my daughter's orphanage. It was something like a university campus, with about 6 major buildings complete with elevators, various age-based care rooms, medical facilities, sports fields, and age-based classrooms including various activity centers and teaching aids. It was a legitimate campus. It's not legal to give up your child in China - although I think adoption is a possibility. But enough children are abandoned, often with special needs, that they have these entire centers for caring for orphaned and abandoned children.
It wasn't all good. There were places in the campus where care was obviously insufficient for the kids they had there. And my daughter, who was cared for in one of their best wings, supported by donations AND detailed instruction and training from US charity, still had food security issues deeply ingrained. The first night I had her she slept in a crib clutching the bread she had held the entire day. Obviously she wasn't getting enough to eat, but she wasn't severely malnourished either. I asked what happens to kids when they get too old for this facility, and the answer was that they're transferred to a similar care facility that's for adults. I would have been interested to see that.
In the US, if a child grows up with severe needs, the parents are on the hook to provide that care. If they cannot, the child can be put up for adoption, but if this process takes a few years (the decision to place the child for adoption I mean), finding a good home can be tricky. Part of the reason is that there is a lack of infrastructure for children with special needs in the US. It's a big ask to adopt a child, with all of the responsibilities that comes with it, that has severe needs. The concern is that they'll end up with an already overburdened family. Each child is basically looking for a family that can take on an entire lifetime of caregiving, often with handwringing about what happens when the parents eventually get too old to do the job. Ultimately a wealthy benefactor is the most secure way, but not everyone can be adopted by Angelina Jolie.
Kids with severe needs also end up getting routed into a public school right along side kids without them. This leaves teachers trying to handle kids with stable homes and every advantage, who are at or ahead of their grade level, while at the same time trying to teach a child who is perhaps years behind, and requires entirely different teaching techniques. This disrupts classrooms and overburdens teachers.
What happens when these severe needs children reach adulthood and their parents ultimately are unable to care for them, or die? Some of them will become criminals, simply because they are unable to function otherwise. We wait for them to victimize someone, and then incarcerate them - where the prison system attempts (inadequately) to care for them.
We need caregiving institutions that can handle kids with severe needs. We should not be expecting the parental lottery to just leave some people with a burden that they simply cannot handle, especially in a country without guaranteed access to healthcare for all people.
Child and adult care institutions can help prevent some people from ending up in prison, can offer better care for the people that need it, and can handle some cases where someone has committed a crime not because they are capable of and intend to harm people, but because they are not capable.
Similarly, the entire structure of prisons seems to be centered around punishment. A criminal enters a prison and "pays his debt to society" (let's face it, "his" is the right pronoun here). He serves his time, and then is kicked back out into society and expected to make his way better than he did before, but now with added disadvantages compared to what he had before. The expectation is somehow that he'll feel like that punishment incentivized him to straighten himself up. No concern seems to be given to the fact that he may be unable to straighten himself up, and maybe his tour in prison actually decreases his incentive to stay out.
The goal of prison should not be be to punish, but rather to either remove some individuals from society while caring for them - because those individuals are dangerous - or help rehabilitate them so that they can enter society successfully. The reason the goal is not to punish is because we need to acknowledge that many of these people my have committed a crime not out of some sense of "evil" that needs to be judged, but because they lack some kind of care or instruction that they need to function in a healthy way. I'm not sure there should be a single prisoner who doesn't have some kind of therapist assigned to them. The idea that they can spend a few years in prison and be fixed is insane.
Homelessness ends up being the same kind of issue, often for the same reasons.
I get your guardianship idea for children, but how would this work with those who become cognitively impaired?
It exists currently for people who are cognitively impaired. It's called "Medical Guardianship".
Also, what if there's a dispute over responsibilities between the parents? Should the male parent be allowed to walk away even if the woman decides to keep the child?
Any or both biological parents should have an avenue for exiting a guardianship requirement. That might be either never signing up in the first place, or taking an off-ramp prescribed by the guardianship agreement (which may need to require a transitional period for placement).
I'm worried we could become more callous to suffering and look for the easiest option. This could include how we treat unborn subjects or those failed by society. In Canada, a
recent poll showed how many people thought euthanasia guidelines should expand to include homelessness (28%) or poverty (27%). This would take it beyond providing it only if someone had a medical condition. Such a step may have negative ramifications for how the poor and homeless are treated.
I would agree with those sentiments for euthanasia. Suicide is an important human right, one of the most fundamental. I'm not sure that it is more fundamental than the right to life, but it is up there in significance. It's hard for me to rank it because I see circumstances where you have a right to life but not suicide, and I see other circumstances where you have a right to suicide but not a right to life. The former would have to be temporary though, while the latter does not.
I would absolutely not deny an otherwise healthy individual the right to suicide for basically any circumstance, including homelessness or poverty.