1) Most Hispanic people in the Bay Area are US citizens or lawful residents, and licensed (and pay taxes, and are otherwise generally representative of everyone else). We're talking about the set of people who get caught for unlicensed/suspended, which is already a pretty small subset, and not representative of the overall population at all.
However, most unlicensed people are that way due to immigration status, which is almost entirely Hispanic people (since our illegal immigrants are essentially all Mexican or Guatemalan). Suspended license people are often DUI or other things like that, which I'd assume is much more universal. I don't know the breakdown between unlicensed and suspended; generally I think suspended/revoked are punished more harshly than unlicensed, partially because you have to be a fuckup to get your license suspended in the first place, and it's a bit more willful to continue driving at that point. If there were no legal way to get a license, it's a lot more morally defensible to drive anyway (although, insurance...); fortunately CA seems to make it possible to get a license anyway, so failing to do so is an affirmatively lame action.
2) No -- I meant if you wanted to prosecute someone for the unlicensed, but your PC to stop him originally was bad (i.e. you claimed he ran a red light, but it turns out he didn't), the court would let him walk (rather, it'd never go to trial).
If a cop had legitimate PC to stop, and then stopped and found suspended license, the cop would almost certainly cite/arrest/whatever for the suspended license.
Those are two entirely different cases. (It's pretty easy to generate legitimate PC to pull ~anyone over, though, due to how the vehicle code is written and how people actually drive.)
(Another unanswered question is "is there a variation in vehicle maintenance or driving rule compliance in different race/ethnicity drivers?" -- I tend to think there isn't. Even if you wanted to go by rich/poor, I've even seen plenty of expensive cars with maintenance issues, and obnoxious rich people with huge numbers of bikes on bike racks obscuring license plates, unsecured loads, etc. The only real distinction I've seen is that pickup truck drivers, in general, are the cause of almost all object-in-road problems.)