Japan is not NY and arguments based on sociatal/cultural behavior don't apply universally. Do you personally use these scary subway systems in the US that you have so many stats about?
As for “it doesn’t apply universally,” that’s not an argument because almost nothing applies universally - not even a sunrise and sunset, if you’re at the North Pole. My point can still be valid in almost all metro areas.
Finally, let’s say I did use these systems (and, sometimes, I do use public transit). I’m a man, you are 90% likely here to be a man, we’re not the ones getting groped, therefore our personal opinions on the likelihood are obviously irrelevant. You should be asking your wife and your 15 year old daughter to ride for a year and rate their comfort level.