I bet most of us could walk through town right now and with a high degree of accuracy pick out the ones who will be doing looting and killing.
But when the SHTF they will make themselves known in no uncertain terms. Especially when things first start to break loose.
They will be the ones looting the local stores and the houses on the next block, driving into our neighborhoods in caravans of packed cars waving their stolen weapons. They will be the ones dragging our neighbors out of their houses and beating them senseless.
When they come down our driveways or up to our homes we will know who they are and why they are there.
I was thinking more about the enemy faction among the political leadership, the ones who give the orders, than about the usual predators. For instance, my local RINO congressman and the state's two far left whacko RAT senators, the leadership of the county RAT apparatus, the RINO county sheriff, etc.
Then there is the moral problem of when preemptive self defense becomes murder. Is taking them out morally justifiable, and are their families EVER legitimate targets? (No, never!) I know, their side would not show such restraint, but I am not them.