I suspect that elected officials would feel significant pressure to act if this happened in London on a regular basis.
In my country, our recently former Prime Minister was known to regularly catch trains while going about his government business. Sometimes with a cabinet minister. Sometime on his own. And rarely, if ever, with a visible security detail.
https://www.google.com/search?q=Malcolm+Turnbull+train&tbm=i...
Only time I've ever been jumped or harassed on a train was in Madrid.
how can you tell when values are wrong?
That's a chilling but very accurate description. I don't have children, but I doubt I could live in SF/LA/NYC with kids. There isn't a major European city I'd say that for.
It's not often that I see people having fights in public here in Australia, but on the odd occasion that people are misbehaving, I really don't want to cause myself trouble and hurt myself. I'm not inclined to get bottled or stabbed for trying to help someone out.
On the other hand, if I do come across someone passed out in public who looks a bit fucked up, I will make sure they're alive and at least vaguely responsive, and roll them into the recovery position. I wouldn't call an ambulance though because they're expensive and I don't want to cause someone a $2000 bill because they were just drunk and sleeping it off.
I've never been to SF, but I've visited NYC, and the subway there feels like stepping in to a horror movie.
During a two week visit I saw people passing out and being ignored (I was the only one attempting to help), individuals swinging around bricks in socks, and various other obvious examples of severely mentally ill individuals.
In London I've never seen anything like it.
It genuinely felt like stepping in to some sort of twilight zone. Compounded by the fact that other commuters seemed jaded, as if it was normal to be regularly surrounded by individuals who act more like rogue AIs than human beings.