From my observations, the effect of disturbing content seems to depend on the person. Some people see it, are disgusted by it and are largely unaffected. Some people (like myself), see it are disgusted by it and then are bothered by it for a long time.

I've noticed that my son is the same way, so I tend to be very careful about what he sees. He's definitely more sheltered that some of his peers, but that's based on how he reacts. It's important to know your kids and know how much they can handle.