A brief search came up with trains being around 15-20x safer than driving. As with many things it matters a lot how you count but it’s a pretty huge gap.
Statistics will not capture 10% of the harrasment people put up with daily.
New yorkers have some massive Stockton Syndrome with what they are used to. Some will argue that if you complain about human feces on the train, maybe you should go back to Ohio, I see it daily.
As someone who lives & works in the Bronx, I haven't encountered any harassment in the Bronx lines. Pretty much every negative experience I've had on any subway line has been in Manhattan.