What is wrong with us?

Few days ago I heard on the news that one teenage girl beat up another teenage girl really badly. And others just watched this happen, filmed and even encouraged that bully to beat her victim even harder. The masses always wants bread and circuses...even more so if those circuses are bloody. One would think that after all this time we should have evolved past enjoying gladiators fighting. But those fights still thrive to this day. From combat sports to such beatings without any rules at all. Humans are very bizarre creatures.