Pandora said:
It really takes a sick individual to sit with some sort of glee and watch two living creatures rip each other up.
I can't agree that it is sick. This sort of thing has been going on since the apes found the monolith*. It is a part of the human condition, and most likely hardcoded into our DNA since the first creatures crawled screaming out of the primordeal ooze.
In our culture which values peace, companionship, and love toward critters (except for the ones we eat, of course - and except for the ones whose flesh we wear, and the ones we swat for annoying us, and the ones we use for their inflammable fat, and the ones we use to make our medicines and potions) we have forced ourselves to overcome this desire to watch animals turn each other into minced meat.
Instead we go to movies where we watch humans turn other humans into scrap material, or we go to boxing matches, or football games, or wrestling shows. Instead we gawk like idiots when cars crash together and splatters someone's brains all over the pavement.
It's called bloodlust.
It's nothing new, and not really classifiable as "sick".
NOTE: None of the above means I endorse, encourage or in any way condone this behavior. I think the people involved should be quartered. I just don't think they're mentally incapacitated.
*1 point