Something you may have missed in this discussion is that BART has hardened its most frequently-used gates and is still in the process of hardening all of them with new fare gates and other infrastructure. This has noticeably decreased the frequency in which people are casually engaging in theft of service. In all of Downtown San Francisco with the new fare gates installed, you can't just step over them anymore, nor is circumventing them a subtle and quick matter.
> I'm envious of your ability to access people's bank accounts and occupations by looking at them.
It doesn't require magic to look at someone and assess their clothes, the items they're carrying and general hygiene and clock that with the time of day, or even figure out what their occupation is: mostly office workers and others who work in downtown San Francisco. Most of BART's passengers are commuters with jobs after all, they're not just riding it for fun which is what you would expect from a commuter rail system. Paying for transportation whether that is the bridge toll or the BART ticket is each person's responsibility, and notably there are tax incentives for public transportation within the Bay Area already, and as I noted up thread, plenty of discounts.
