My first thought when I saw the video was that it would be fun to use a shotgun instead. Now that would be a great trap and skeet shoot.
Sure, I understand the concerns about wanton waste, and I also understand the various environmental concerns. The problem is the unpredictability of invasives.
The common carp still does a lot of damage, and in my neck of the woods, nothing good has come from them. On the other hand, Bass are not native in my area and they are a benefit, at least according to most.
Washington State and the surrounding states are spending a tremendous amount of money to keep Milfoil down, and to keep zebra mussels out. Still, birds spread more than fishermen and I have never seen a check station for ducks and geese. In short, they are tossing a great deal of money down the proverbial toilet.
I see no waste in killing all of the flying carp they can. Sure, if the dead fish can be used, that would be better, but the damage done to the water and the potential injury to recreationist on the water is sufficient to justify what the video is doing, in my humble opinion.