Violence in books: Do you become desensitized to them?

With some of the books I recently read, I realized that violence in my books no longer shocks me as much. Used too, I would cringe if someone gets hurt, or if a gory scene was described. Much like watching movies, I do the mental thing of putting fingers over my eyes so I don't have to take in all the violence and blood and gore. However, after reading several books containing plenty of killing, fighting, beheading, and etc., I'm kind of sick of them.

I understand the need for violence in books. I have nothing against it. I'm definitely not one of those people championing for no violent video games for children. But sometimes I wonder if the violence in books serve their purpose anymore. In my opinion, usually it's used to show how awful or evil the antagonist is. Other times even the protagonists have to fight to the death to save their lives. 

For example, a few PNR I read in the last few weeks all had some kind of mutilation or torture or dismembering. The protagonist actively engages in torturing his or her enemies for information. Now, I don't want to talk about the right or wrong of torture. It's way beyond what I want to say. The point is, I didn't blink an eye at this. I just didn't care enough. It's all part of the story.

Another good example is when the protagonist walks into a particularly bloody "crime scene". You know, one where there's blood and other stuff splatter all over the walls. This used to bother me a lot, because I hate anything gory, but now I don't even think about it. Now I get really annoyed and always think, "OK, I get it. The bad guy sucks. Now go get him. I don't care about the brains splattered on the floor" or something along those lines. 

See what I'm reduced to here? I always feel bad but I can't help it. It's like I'm not paying proper tribute to the people who died, but that's just another problem. Often, with this much violence going on, most of the people who die are not even important. They just show up and die. And we're suppose to feel sad. It doesn't work that way. If I never cared about the character in the first place, his or her death won't mean anything to me. 

Maybe I need a break. I switch up my book genres all the time, but now I really need to stay away from books where there're plenty of bloodshed and slaughter, at least until I don't roll my eyes at somebody getting killed.

So what do you think? How do you feel about the ceaseless violence in some books you read? Or do you not even think about it?