I don't, or at least not with regard to people like this. The world will run out of bad people long before it make a serious dent in the numbers of decent folk.
 
	Low profile policing without a sub-machine gun in hand, or a checkpoint on every corner or some official checking your papers on every bus is a price you have to be willing to pay if you want to live in a free society. Unless of course you want to live in a police state, for which we have a number of tried and tested models.