For a start, Theodorous, nobody needs to be a scientist to talk at the level we have on this thread (although I think Maid is). I didn't Google except to find a quote to end gravitygate. This is extremely basic stuff - GCSE level, as I said.
Of course people can believe what they like. I would go so far to as to say that it's essential for a healthy society that we have that freedom - the alternative is unthinkable.
But, I strongly think that overall believing codswallop is very bad for everybody in the world. Gullibility is the con artists dream - if they'll believe anything you say, they'll give you anything you want. You only have to look at the mega rich, bouffant-hairstyled evangelical Christian Ministers in the US to see that.
By and large, people call psychic hotlines, or whatever, to find out if he's planning to propose, or still hankers after his ex. Harmless (ish) - fair enough. But what if they are a bereaved mother who cannot cope with the loss of her child and so are receiving messages "from the other side"? Someone is making money out of her grief and lying to her - piously pretending they are providing a service. It's despicable, nothing less.
I think such "services" should be banned, but I doubt they will be.....free expression and all that.
I think the best way of getting rid of these con artists is to make people less gullible in the first place.
And, a word about "personal beliefs". Beliefs involving ghosts, God, the efficacy of homeopathy and so on are not actually that "personal" - they're a claim about the nature of reality, a reality we all inhabit.
If some one, anyone says, "I believe ghosts are real" - that's not just a "personal" belief. They hold it personally, of course - but if ghosts are real for them, then they are real for me too. If you make a claim on a public website about the universe we all live in, someone will address it and show that it's not true.
That's why I think Dione is mistaken - personal beliefs of this sort should be logical & they can be addressed by others in a debate format. The problem, of course, is that belief in God & other woo is neither logical or rational to begin - if you didn't use reason to arrive at a belief, you flounder a bit when you try to use reason to support it.