Chaim, you support one form of conspiracy theory, regarding Rabin
http://www.jtf.org/israel/israel.rabin.assassination.htmthough with rabin, you could say it's not theory but fact.
However, any conspiracy theorist would say that too. And it's ridiculous to investigate all their claims.
Any "conspiracy theories" attacking the catholic church (especially absurd rantings and long copy pastes, are clearly inappropriate and would offend christian members.
I think your common sense would sort the good from the bad.
But as we know israel is so full of corruption, there will be many true conspiracy theories.
I don't think for example, that various theories on rabin, should be banned.
They are largely based on fact, medical reports. and they are not copy-peaste rants. Common sense has to be applied.