You might not, but I do. Kind of the point of the thread.
No you dont, you just pay lip service to it to make yourself feel better. Lots of people do things like that. Writing on the internet lets you feel morally superior without actually having to change anything about your life.
Every KO is terrible for someone's health, but you watch anyway. You still watch MMA after seeing Erick Silva get beaten half to death, or James Toney's obviously punch drunk speeches.
We all still watch because no one gives a shit about brain damage.