I sometimes joke, "what about the cancer?" And not just in jest for despicable people afflicted. These are weird evolutions of ourselves. We should study them. The shit probably isn't going to be as cool as Butcher from The Boys, but ALL the removed masses of human brain tissue should definitely be preserved in a non-destructive way as possible and should be studied. I don't think we can fully understand brain abnormalities before we understand the brain, but seeing some failure cases has to help.
So we should remove them especially as we lack the full understanding to know if they are always dangerous.