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Lots of speculation e.g. level of sobriety, showing off, story-telling after the fact, etc, but just watching what is in the video, I think it could be something more mundane -- he perhaps just got complacent, and didn't devote enough attention to what he was doing. He comes in with stuff balanced in one hand, you can see him talking to his wife, then fumbling, and just as he starts to actually pay attention to his gun - boom.

I suspect he has made this transfer from holster to pocket more than a few times in the past (having handgun in your hand in your pocket is advantageous if you are traveling thru known bandit country), it became something akin to a habit, and he stopped paying genuine, conscious attention to his gun handling. It is my observation that inadvertent discharges (and many other accidents) happen because one is not paying direct attention to what one is doing, whether driving or gun-handling. It is easy to run on autopilot and become lax in execution when you have done the same thing so many times. The four rules don't address the cause of unintended discharges, they just try to interrupt the chain from the root cause to an unintended and unhappy consequence.

When commenting on such events, I try to keep in mind an excellent observation on the law from a certain retired attorney:
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