The situation is weird. No one thinks like this, or it isn't a problem, in cities that actually have good public transport. A drug addict has never entered my mind when riding public transport in London, Paris, Sydney, Tokyo, etc.
When transit is good everybody uses it and normal people are the vast majority so you rarely see or notice the bad people.
The percentage of bad people is about the same in both cities overall
Which is why I was curious about specific experiences.
And I do say, better than many US suburbs which have absolutely no service at all.
Maybe with gas inching towards $9/gal we'll finally get people in the US demanding actually decent transit options.
The busses around me are either natural gas or EV, so they're pretty disconnected to the current energy crisis.