Your ad hominem only means you don't have any basis for your unsupported and downright silly comment that this man is somehow 'at fault' for being shot.
Wittingham may have been in the wrong not to let the party know he had gone off the line, but the entire onus was on VP Cheney to know where everyone was at before he pulled the trigger.
Yes, this was an accident, and luckily not a tragic one, but the bottom line is the fault lays at the feet of the shooter in all instances.