I knew this vid (and similar where people feed living mice) and it made me sick when i watched it, not because of the fact that an animal dies in it, but because of the intention of the people who made it.
They get a kick because they see a frog being torn to pieces and being still "alive" to the very end. I feed my snakes live or p/k, killing the rodents myself by breaking their neck and i am an avid fisher, so I am not on the soft side if it comes to dealing with killing animals. But in this case there is no reason for this frog to die in such a manner, except for entertainment, so if you are ok with something like this you should not oppose bullfights, dogfights, cockfights, bettatournaments... whatever. (Some of the mentioned offers even "better" entertainment and can look back on a long tradition)
P.S. : I would say the frog is a toad and i doubt they make a very healthy diet for piranhas