I have those too, think I always will. They aren't as disturbing to me anymore - more like "well, there goes that brain of mine again, thinking that crazy stuff".

Then it kinda just drifts away.

It still amazes me that I can think about something awful like that with the same emotion that I would attach to thinking "wow this soap really dries my skin in the winter", but it just seems that's the way it is for me.