Oh, it is fine with me for my kids to watch the show. But, they are boys and not very prone to being scared. If I had a sensitive child that was having nightmares, I might decide differently.
Actually, my kids have had two movies that scared the hooey out of them. My older son watched "The Indian in the Cupboard" at least once daily for over a year. Then he became terrified of it and didn't watch it for a year. When he finally did again I had to hold him through the horrifying part-when the teeny Indian pricked the boy's finger with his knife! It was very hard not to laugh.
Both kids watched a movie at their Dad's after we separated, nightmares ensued, and they talked of "the beast" for well over a year. I finally asked him what they had seen that had "the beast" in it. It turned out to be Disney's "The Sandlot"! I bought a copy and made them watch it. It helped a lot and then I could remind them that the beast was a nice dog named Hercules. So I guess I don't necessarily believe in protection, sometimes seeing it actually helps. (In hindsight, I wonder if the timing of Dad moving out and seeing the movie made it much worse?)
I do know as a parent I'm much more likely to protect them from something that I detest myself. WWF? Absolutely no way! Nascar may not be as offensive as WWF, but we are not watching it here.
Hee, hee, reminds of the time my older son squealed on the younger one..."Moooooooom, Gabe's watching GOLF!"