Some behaviors I’ve seen on public transit in the Bay Area: loud music, dumping beer and food on the floor, clipping toenails, smoking, jumping up and down on seats, drug deal, fighting, hitting the driver, attacking the bus with a machete. All in the past year. Granted I take transit more than most.
And people are generally afraid to speak out against bad behavior because you never know when someone has a knife/gun and is mentally unstable.
So I don’t think it’s just a frequency/headway problem. I wish it was better, but I also understand why many people are decide they’d prefer a private car.