Maybe this is me being ethnocentric, but it seems the American way of embracing diversity (through political correctness, affirmative action, etc) has come at the cost of craving for isolation and independence from each other.
It's not clear how public transit advocates will convince us to vote to downgrade our lives. Maybe the bicyclists and pedestrians in cities will be able to block suburban drivers from entering.
If there was more public transportation, the problems you bring up about personal space would go away.
When the problem you're trying to solve is "some people aren't in Times Square right now," you might need to engage with the fact that it's crowded.
More public transportation, sure, and I'll vote for it every time.
Less car infrastructure, and there is no pressure for public transportation to be comfortable or effective because the only way to opt out of it is to move away.