I don't think anyone's trying to stop people from enjoying the horror stuff. It's just that not everyone enjoys that. And so I think that displays that are public, in your front yard, should be tamed down a bit.
The link that kherbert posted--that looked like a horror movie to me. There was nothing "Halloweeny" about it at all. (To be fair, though, they didn't show how the rest of the house/yard was decorated.) The link The Tardis posted--that didn't look like Halloween to me, either, more like a science fiction movie. Although I liked that one and didn't like the one kherbert posted.
As a kid, I could not watch horror movies. They scared me and left me with nightmares for days afterwards. As an adult, I still avoid them. So I can understand why parents with sensitive kids would not want ghoulish, creepy, over the top scary displays out in public, where they might have no choice but to drive past them with the kids a few times a day. I'd prefer these displays were kept inside the home or in the back yard, where I can avoid them.
People can avoid the haunted houses. People can avoid horror movies. But they can't always avoid driving past the neighbor's house with the huge Halloween display.