We don't question seeing stars at night, even though what we are seeing is very far off and happened a long time ago. That is because we understand how it all works.
So I keep an open mind about haunted places, and ghosts, and the like, because so many people have confided strange happenings to me, and I've had a few things like that happen to me.
Also, I agree that some people are just not sensitive to such. I've known instances where people bought a house where a family had lived quietly for decades. Only when the new family moved in did things start to happen. And they are not necessarily bad things; simply inexplicable things. According to what we recognize as science, now.
A few hundred years ago, I'd be burned at the stake for heating something up in the microwave, wouldn't I?