What information is face recognition going to provide? as per the pinterest page you linked, the police already know the suspect's name and information, they just can't find them. It's unlikely google or anybody else is going to get a current address for these people just by running facial recognition.
The photos which Google (or much more likely, Facebook and Twitter) have often contain embedded geolocation data which gives the police a better idea of where to start looking for the person. Of course, this is a lot more work than posting up the equivalent of virtual wanted posters and having people give information which is more likely to be recent than pictures collected by social networks.
