You&#x27;d be hard pressed to find any, other than anecdata.<p>Yesterday, a small woman was assaulted (just pushed hard, luckily she did not fall) in front of me by a woman who was clearly off kilter (rambling to herself, shouting periodically to noone, etc.).<p>One day, a similarly off-balance gentleman started hurling obscenities at me and threatened to punch me. He was a foot away from me, and I was on the MUNI train, so nowhere to go. I stared him down as his spittle flew in my direction, and he walked away. Coincidentally(?) I came down with the worst throat infection a few days later.<p>And then another time a guy who had severely bad hygiene problems got on the N train, which was already crowded.... and then the train goes into the tunnel before Inner Sunset. I have never felt so nauseated in my life. As soon as the train got out of the tunnel, half the carriage emptied, with people gasping for air.<p>And then one time a mentally ill person (from appearance) got on the bus, stood behind a young woman and started slowly humping her. I would have done something, but he was huge.<p>And then there was this time a mentally ill guy was walking down the sidewalk, totally in his own world... but the asshole grabbed my crotch as I walked by.<p>In contrast, I have never seen such a thing being done by a non-mentally-ill person.<p>Make up your own mind.