Personally, I like the dad's willingness to take more drastic action when necessary, but I think he got the execution wrong. I think he showed his anger a bit too much and I don't unloading that many rounds was a good idea.
If I were him, I would have kept it short, sweet, and to the point. I probably would not have deemed destroying the laptop necessary either, only taking it away, but since I don't know the full story here, I will assume for the sake of this scenario that drastic action was required. I think a baseball bat and a single, hard swing would have been more appropriate. Sends the message without getting excessive, but if guns are his thing, one shot would have been good enough, and he definitely should have calmed down first.
As far as "violence" goes, I don't think its unreasonable to spank kids who do something to really earn it up until they are teenagers. That's when you have to start relying on taking things away, and I don't think destroying a laptop is out of scope if the situation really warrants it. Like I mentioned before, I think the dad's composure when he made the video was not paticularly good, as I believe he overreacted with much of what he said and with the excessiveness of shooting it multiple times, but hey, if taking it away doesn't drive the point home, maybe destroying it will.