It doesn’t appear the system has been very effective in recent years, compared to other approaches internationally, unfortunately.
It doesn't seem like they hire enough people.
That's more likely because these places (as does Europe, by the way - we also don't have people burglarizing trains!) have robust social security networks for their population. The homeless get at least basic assistance, the mentally ill get taken care of.
The US does neither. People who have fallen through the cracks simply don't get any help at all (except from some charities), and mentally ill people don't get any care.
With the exception of Japan, every one of the places I listed spends less on social security and welfare in general as percentage of GDP than the US does. In most cases, dramatically less.
And on top of that, it creates a very effective price cap on rents in the non-social housing sector, because people could just go and live into marginally lower-quality housing instead.
Law enforcement is the state’s job, and companies do pay taxes. Blithely ignoring train robberies on the premise that if it gets bad enough, the company will hire private armed forces won’t lead to the kinds of societal changes you’re hoping for.
The kinds of theft happening in LA on a regular basis are essentially unheard of in places like Japan, Korea, Singapore, Hong Kong or Taiwan. Any such occurrence would be shocking news and police would be all over it.