I can't really disagree with any of that. Except perhaps this:
I'm not really sure anybody has a moral obligation to do anything any more. Perhaps I've just become that cynical, but in a land ruled over by psychopaths and populated mostly with idiots, a horrifying hybrid of tyranny of the majority and oligarchy (something I think your examples would tend to agree with, if not yourself personally) I rather feel like ripping up the social contract altogether.
It's a very personal thing, I guess. I still feel that obligation in my heart, even if nobody is actually compelling me to feel that way and it's a wholly unrewarding way to live. A certain family member of mine recently posted something unfortunate on a certain social media site which I felt was morally repugnant. I mentioned it to my brother; he counselled ignoring it. I talked to my father, he made the same call. And then I found myself wading into the thick of an unwinnable battle against that person's deep-seated prejudices anyway, because I am physically incapable of keeping my mouth shut when something feels wrong. And to my surprise, after three days of debate I managed to persuade them not to share uninformed opinions on that topic again! It makes no difference in the grand scheme of things. That person will still vote for the Conservatives when the time comes. But at least there's one less voice out there making hateful posts about that particular topic now, and the burning indignation inside me is calmer.
I don't have a way to switch off my sense of moral obligation. It's the same reason I always attempt to engage with trolls on this site before dragging them off for punishment. I know I look like an idiot a lot of the time but I can deal with that if there's even a tiny chance of a better outcome. They say that we're supposed to get more comfortable with supporting the status quo as we age but I feel as though my life has had the opposite trajectory thus far. I still want to believe that we can be better.
You may write yourself off as cynical, ayase, but even cynicism, when tempered with intelligence and a genuine interest in respectful discussion, can have a positive effect. I feel your vent posts have encouraged me to educate myself more on some of the highly specific issues we've debated in the past and given me some faith that other people out there aren't slavishly signed up to the official narrative, even if the delivery is different and we vehemently disagree at times. So I'm always grateful to you for speaking your mind.