i do agree it is wrong for these fish to be taken out of their habitat like that, but by having fishtanks, we all encourage this everyday. Even if you do buy cultured fish and corals, the industry still moves forward and there are things like liverock which will always come from the wild. To that guy's deffense, at least he is using air and not chemicals that will do much greater damage.
on a side note... everytime i watch this kind of video i always look at my tank right after and think about how much happier all my fish would be in the wild where they belong