They don't know their a$$ from a hole in the ground.
Saying that a military trained sniper is doing this is a fair assumption. I think implying it is an American is far fetched. People either go off like McVeigh (clear political motive) or they pull a Texas AM Tower (Brain Damage). One is methodical, the other is just base emotion. This one is methodical, and is against clearly innocent, non-political elements of society. This is terrorism, insisting it is a former or current member of the US military is tin foil hat time. Not impossible, but considering we are at war with a violent religion that encourages this MO, it is improbable.