Is it wise or stupid to avoid exposing yourself to certain information?

you know like news articles about about horrific genocides, or the many ways children can get d, or just some really realistic violence or racist attitudes or anything else that is generally uncomfortable to think about. I used to believe people should be informed and that censorship is a bad idea, but the more I think about it the more it makes sense that certain things just shouldn't be in your head, because they will change you.. they will jade you and make you cynical, and make everyday life a little bit harder. is the truth worth knowing in this case? theres no way to unsee something once you've seen it.