99.999999% of folks immediately discount bc it defies (our human) common sense. Just like a particle can exist anywhere and everywhere at the same time. Human logic just doesn't work.
I think a lot of people can't handle the notion that it could be fake and that our existence (if you can call it that) has been meaningless.
But really, what are we in the greater scheme of things? At the lowest common denominator we are bags of water and a little bit of electricity.
I find it soothing to think that this really could just be a simulation or just one of a billion parallel universes.