By being aware long before it happens. Or you can just give up and be a victim like her. Everyone in the world knows there is crime everywhere by the time they grow up to be a teenager. It's no one else's fault but yours to not be prepared. Train, lift, scan environment, carry protection, or anything would have prevented her fate. But instead she chose to be weak and unprotected in a jungle like the NYC where you're mostly outside on the streets. The thug didn't just randomly pick a victim. He specifically CHOSE her because she was the weakest from the crowd.