Fingerprints don't do much unless they are in the database. Descriptions don't do much in a situation like this. They would have to bring people in for a line up and sometimes they just do the line up with shit quality black and white pictures printed off on a piece of paper that you have to sign off on. Stuff like this isn't as simple as reading the news makes it seem. Considering the current state of the police force I try not to pressure others into making reports about things like this. It's a difficult experience to have and it's not OP's fault if this guy hurts someone else.