No sher, s**tlock... (ref. to "Prof." Fox here...*) Sure took him both braincells to figure that one out.
I keep coming back to a small detail in the snipers' behavior: One shot, even when they miss.
A real psychopath gets his kicks from watching people die, from reading about their deaths... but whoever is doing *these* shootings has enough fire discipline to only shoot once, even when he misses
Methinks that someone with a deep-rooted hatred of humans at large would not be able to resist firing again, if they failed to connect. Remember, they've spent hours setting up the scenario and waiting for the right target and the right circumsatances. Nevertheless, when he/she/it misses, there is *still* no second shot.
Whoever this is, is a professional...