In this post-apocalyptic senario... ask yourself who will be the most sinister post-apocalypse visitor to your neighborhood?
Not the inner city negroes(from Chicago in my case).

Who knows your neighborhood and residents like the back of their hand, and drives thru it daily.
Who in desperation, will have to feed/provide for their family as everyone else, and has the mindset to do it.

This 'who' is and should remain nameless.