That's a pretty big assumption. I haven't seen enough information released yet to conclude that.
Not really. They jumped out of a car and went into a field, shooting at one covey and then another, rather than exercising basic caution to ensure that the entire party was accounted for. And someone provided a link to a canned hunt where Cheney bagged 70 pheasants - so he's out there to shoot a lot of game, not just to hunt.
I don't like this incident one bit. It speaks very poorly of Cheney. We like to poke fun at Al Gore for aiming his M-16 at his head in Vietnam. How is this much different - poor gun safety - and, in this case, someone got shot.