Earlier quoted context omitted.
As an European I don't mind buses at all. I neither feel unsafe nor I find them dirty. A single bus carries on average 20 times the people cars occupying the same space would (as you rarely get more than 1 person per car in peak hours). I'd rather take buses than the car in any city. Cars make cities dangerous, noisy, polluted, congestions make people nervous behind the wheel, fights are far from uncommon. Finding pa…
Maybe it goes without saying, but the reason you don’t mind the bus in Europe is not because you are European but because the European buses are nicer. The things you say about noise and pollution are also true in the US, and American drivers are acutely aware of them. But the alternative is not a European bus, so people drive.
Taking the bus around sf makes it immediately clear why (not all, but most) people who have options choose them.