[wizofaus]

If the city you live in has been entirely designed around private motor vehicles and lacks any decent transit network (LA being the obvious example), no amount of investment into helping the mentally ill and drug addicts is going to make transit an attractive option for more than a tiny percentage of the population.

Thankfully in Australia's biggest cities our public transport systems are generally clean and safe to use - but a) they're not always super reliable, despite some improvements in recent years b) they're often poorly interconnected, meaning I could potentially do 80% of the journey sitting in comfort on a train, but spend 3 times longer than it would take to drive trying to deal with getting to/from train stations and c) there are still huge areas of said cities that are fairly poorly served by trains, and buses will always be a second rate way of getting around. Oh and d) you can't carry v. large items or animals on most public transport (*). All solvable problems, some easier than others, but there's a distinct lack of real political will to do so.

(*) e.g. it'd be a 15 min train ride to take my dog to the beach from where I live, but she's not a service animal so wouldn't even be allowed on, despite taking up less space than a human.

[wizofaus]

(Ooh, I actually just looked it up - you are actually allowed to take dogs on trains here, though they're supposed to be muzzled. Never seen anyone do so though, and I'm quite sure they wouldn't be allowed on buses).