Which world would you prefer? A world where not a single crime would go unpunshied, and hence serious crime would probably disappear forever, but with the risk of the Government or criminals (would they still exist??) abusing the data for their own advantage? Or a world as we have today where a lot of crime happens everywhere and where a criminal just needs to be smart enough to never get caught? I am not sure the answer is as straightforward as everyone seems to think here. I think I would be willing to at least run an experiment about this (perhaps China is already doing it).