Dude, stop trying to turn him into some kind of super spy.

1. It was more like a 150 yd shot. The news readers are just too lazy to pull it up on Google earth and measure.

2. That's a typically hunting distance. Typically hunters with typically equipment make 150 yd shots every day.

3. He missed his mark by ~6". A prudent person would aim for the chest. Someone who plays too many video games would aim for the head. Nobody aims for the neck.

Motive is what differentiates this nut job from the average man in the street, not means or opportunity.