Am I the a-hole?

A friend of a friend had an abscessed tooth. He wouldn't go to the dentist or do anything about it. After a couple months, the infection killed his tooth. It then spread from his tooth to his sinuses and then to his brain. He had to be put into a medically induced coma for 6 weeks. He went through several surgeries and is now only able to blink and move his thumb when he hears his name. No one knows whether he'll be able to talk, walk, or be a vegetable the rest of his life. He's in his 40s, has a wife, and a couple kids.

The whole friend group is very upset over what happened. I've never met him. Like I said, he's a friend of a friend. I feel bad for his family, but I've stayed out of it because all I can think is, All this because you wouldn't go to the fricking dentist?

Edit: Am I an a-hole for not caring when other friends are visibly upset. It's getting hard to pretend I care when they tell me He moved his arm today or He tried to talk today.