I lived in NYC for many years. Bodily fluids and liquid left on seats, litter, gag-inducing smelly people, people having episodes and screaming, all common enough to see on a weekly or monthly basis as a daily commuter. I have not been to Japan but I can't imagine they have the same level of antisocial behavior
> weekly or monthly basis
So not "extremely common" as the commenter upthread said.
> liquid left on seats
As in, something spilled?
> litter
Lol. Only on a weekly or monthly basis?
> gag-inducing smelly people
I think some people are looking to be judgmental.
> antisocial behavior
That's taking it pretty far; it's easy to ignore these things which are almost always harmless - none have ever affected my life. Maybe being judgmental and (for some) hateful is the real and dangerous antisocial behavior - the consequences have had real and awful consequences for many.