Even in Grenada the primary goal was the protection of the hundreds of US students present. Overthrowing the government was secondary.
Again, it was primarily about protecting American lives and interests. Also, getting rid of a hostile government that was opposing the US.
You'd think so, but try to actually come up with some names. It's harder than it looks, and the impression of the humanitarian US military going in and fixing up rogue states doesn't really match up with the reality. Even a list of coalition invasions that have enforced a regime change that has ultimately left the country in an unequivocally better state is pretty short. Especially if you count after the end of WW2.
Generally it's invasions of states that were working more or less fine (especially considering the range of corrupt and destructive governments available) or had problems that could have been best resolved internally, but that happened to be opposing US interests or just generally getting up the US's collective nostrils.
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While there may occasionally be humanitarian outcomes from some of these invasions, I can't think of one where it was anywhere near a primary goal. The US overthrows foreign governments primarily because they're hostile to the US. Which is legit in it's own way, but I find it a bit troubling when the US gets painted as this saviour of oppressed peoples instead of a rather aggressive power that is willing to use significant military force against countries that operate in ways that are inconvenient. It's a valid way to operate, I just don't like the apologetics, misinformation and retconning of justifications. If you're gonna go in and stomp people cos it's good for your country, have the sack to admit to it. Especially in the case of proxy wars.
It also seems that the number of overthrown governments that end up stable and generally better off afterwards are rather few. Far more common seems to be civil unrest, ongoing violence, and general mistrust of the new government that is viewed as a US puppet.