Nature or Nurture?
Public lynchings or hangings. Lions and Christians in ancient arenas (apocryphal or true?). Gladiators battling till someone dies. Playground fights. Accidents you see when driving. Slowing down and gawking for what reason? Hoping to see blood and gore and death?
I'm sure everyone isn't similarly wired but enough are to puzzle me.
Bullfights
Boxing
Fight Clubs
Pitting animals together hoping the one you bet on wins (which means the others will die)
Someone is going to get hurt and possibly very badly. What's the upside of being a spectator to a spectacle like that? Why do we enjoy watching people/animals get hurt or die?
An ancient inborn evil?