But if humanity were cool we would never have had to stand up against or correct those things to begin with. Human beings regularly and consistently behave awfully towards each other
That makes it sound like only something that is flawless could be considered acceptable, which would make more than one good rating on the cool wall redundant. For a lot of things polled, flawed but still good seems like an acceptable consensus. I'd think humanity would be a good fit for that grade, but apparently the majority here finds that idea far fetched.
Humans have had plenty of opportunity to mess things up, yet have managed to constantly progress. Generally happiness and quality of life is what goes up with time.
Sometimes said awfulness comes from good intentions but are clouded by humanities tendency to take action based off of reactionary animalistic instinct rather than rational thought.
That itself is another thing people are trying to change. Given that species can exist for millions of years and we're already trying to cut off the problem after about 150,000 years it could very well be that the vast majority of human time is spent ignoring unreliable instinct.
Support for the death penalty is a great example of this. The majority of humans will support the judicially backed murder of criminals in spite of the fact that it has never been shown to act as a deterrent to others who might commit such crimes, the risk of killing an innocent individual (sad to say, three instances of this happening in a short space of time was the primary reason for abolition in my country), and the fact that it implies that performing an act of violence on a defenceless individual can ever be acceptable.
Even if true now, that can change later. The trend over time is that people choose rational behavior. If the death penalty does not deliver what is promised, and this is shown to be the case, people will most likely do away with it. Historically I'd say criminal punishment is a good case to highlight the human tendency toward being rational.
Sometimes, however, human awfulness can only be explained by pure malice. Be it the holocaust, the rape of Nanking, or the only people who pay any attention to an individual having a panic attack in a train station being those who stop to laugh, human beings are fundamentally nasty, and this nastiness can only be overcome by an extreme dedication to rational thought, which sadly, most humans are not in a position to maintain.
Yes, I'm a misanthrope, but I feel that humanity has fully earned my disrespect.
Half of the world went out of their way to stop the holocaust, and then took a look at themselves and asked if it should be allowed to happen again and decided no. Nanking isn't exactly celebrated anywhere in the world that I know of. It happened and it was horrible, but it was not condoned by humanity as a whole. I've never really heard of the situation you described in a train station, but I do know that every so often one person will risk their life for another if someone falls onto the tracks. That's a story I've heard many more times.
When it comes to inherent behavior I'd be extremely hesitant to call humans nasty. Cooperation is at the center of society itself. Philanthropy is in our genes. Care and concern are things that set people apart from other animals, it's not something we lack.
I have always had the hardest time understanding why people would view humanity as negative. Flawed is a different story, and from what I see most of the time people don't let flaws completely dictate their opinion of something. If they did, nothing would be good at all. For someone reason though when some people try to self critique their own kind, it all goes out the window. I would agree that humans have done wrong, but I can't see you would characterize them as a whole by a few mistakes.