"The Bay Area Council released results of a survey Tuesday showing safety is the main reason why BART is experiencing low ridership numbers."
https://abc7news.com/bart-ridership-safety-crime-bay-area-rapid-transit/13228110/
People can feel that, BART has always had a tiny bit of grit, but it felt a lot more "safe" on a train packed SRO during rush hour, no matter what.
But if it were perfectly safe they'd still be working from home and not taking BART. If they were choosing some other form of transportation to downtown SF instead of BART, then the other article posted about downtown SF being a ghost town wouldn't be possible, because people would have driven to SF. They aren't.
Caltrain and SMART have zero of this seediness, Caltrain was basically lawyers and investment bankers going into the city and programmers going south. I took it a few weeks ago in peak rush, those trains used to be SRO, it was maybe 20% capacity. Nobody's going in.
Rush hour traffic sort of exists now, in that you actually see a few cars, but compared to pre-covid it's laughable how little traffic there is.