My coworker was sexually assaulted on the BART, on the East Bay side of the tracks. A group of youths started sitting around her, took off her headphones, grope

My coworker was sexually assaulted on the BART, on the East Bay side of the tracks. A group of youths started sitting around her, took off her headphones, groped her, took her picture several times with them groping her, laughed and then left after terrorizing her for 10 minutes unabated. There was nothing she could do, she is a tiny, attractive Asian female sitting by herself and no one stepped in to help her (to be fair, who would risk themselves by stepping in against a large group of youths). She contacted the police, but they said there was nothing they could do and frankly they couldn't have cared any less. She never took the BART again, and moved to the peninsula. There's nothing stopping criminals from victimizing you except the law of large numbers, meaning your only protection is dumb luck these days, and not the police. And if it happens to you, the police largely won't do anything about it.