I'm not sure what you mean, but the NYC subways - and public transportation I've been on in many cities - work well in terms of social trust. The evidence doesn't fit your theory.
Does everything work perfectly all the time? No, not in anything. If you cross the street, maybe someone will drive right into you. But I cross streets without a problem.
No. I generally like Bluetooth speakers - it's nice to share some music and someone's energy, and I mind panhandling less than all the advertising I see in my web browser. At least the panhandler needs the money and doesn't track me, and usually they're pretty friendly and neighborly.
Seriously, what's the big deal? People are looking to confirm all the anti-city hate. Maybe if these people make you uncomfortable, the lack of trust is in the mirror.
In suburbia and places like Tokyo, other people don’t impose their content preferences on me, I choose what I listen to on the train. I dislike ads for the same reason, I get to decide what I want to see or hear. I guess AirPods Pro 3 are closer to giving me that than ever.
Whatever suits you is great. Generally speaking, humans are social animals that live in groups, and sharing space and all that goes with it is natural to us. Many more people choose and want to live in big cities with lots of people around, than in rural places.
Does everything work perfectly all the time? No, not in anything. If you cross the street, maybe someone will drive right into you. But I cross streets without a problem.