There are two components to UFC: the violence and the skill. You don't sound like you're comfortable with the level of violence displayed (completely understandable). As others have pointed out, the combatants are willing participants and not victims, so I don't share the same issue.

What I get out of UFC matches (when I watch, I actually stopped because it was hard to find good matches) is the tactical chess-like maneuvering these guys go through in order to defeat an opponent that effectively knows everything they know. There's a level of calculating brilliance at play for the good fighters that I get a lot out of.