"alcohol appears to be a factor" Quote from the video.
Things are seldom as they appear. Yes, it is possible, the guy was absent minded, careless, foolish, or all the above. It is also possible, his accidental insurance policy, made out to his children, pays out quite well, and for a higher amount than suicide.
To qualify as an accident, a credible witness must be present, and think it was a gun safety class.
I smell a con.