Because this sort of thing does not happen to men. When they get mugged, no one asked, "What were you wearing when he robbed you?"
They were jr high girls walking home [whatever idiot suggested that was the reason], what do you think they were wearing? As for walking home from school, they were in a group and have just as much right to walk in a group or solo, like a jr high boy.
When I was in my late teens early 20's, I would walk in my own neighborhood for exercise, during daylight hours, in frumpy sweats, no make-up, minding my own business, and grown men old enough to be my father or grandfather would peel off the road, get out of their cars, and get into my personal space because THEY wanted me to chit chat. I was not obligated to stop doing what I was doing, but socially, these jerks thought I was there for their pleasure, accessible to talk on MY TIME. When I came off frosty and rightfully afraid, they'd get upset. Yeah, you're just some strange grown man driving up on me as I'm walking down the street minding my own business, and now you are probing me for personal information I'm not comfortable sharing like what's my name, where I live, where I'm going, etc? Ever hear of stranger danger? Yet I'm stuck in a pickle because if I don't comply with your polite girl narrative, you might threaten or hurt me.