Desensitized?

In one of my classes, we've read a lot about slaves in America and their struggles. We did reading on our own and then discussed the text in class. I found the stories interesting and thought-provoking. But, as other people started talking about what surprised them in the stories, many of them described these feelings of disgust they had. I had no such experience.

I skimmed back over the readings to see if I just wasn't paying attention and missed some horrifically graphic event and found none. There were things that I don't like and never want to see in person, but reading about them didn't turn my stomach inside out.

Once I started thinking about it, I feel this way about a lot of things. The other day, my brother showed me a video of a guy getting electrocuted. Again, I didn't like it, but it didn't really affect me.

Lots of people have talked about how you become desensitized to things when you're exposed to the often enough. Have I been exposed to enough violence and injustice that I lack a proper reaction? Or are the things I am exposed to not that revolting, others are just overreacting?

An even deeper question is whether being desensitized is bad. Should it make my stomach turn or should I be able to handle myself? I don't know.