Kinda, yeah. There used to be more public restrooms (not least in every bart station) but they shut them down after September 11 for 'security reasons' and have never been able to figure the problem out since. Sure, you could hide a bomb in a public toilet, but on the other hand that's probably the least-bad place for an explosion to occur if someone ever decides to do that.

If you don't have public toilets, then drunk people are gonna relieve themselves in alleys and the like. That's just a fact of life, not a moral issue.