Do you know of anyone like this who posts on Free Republic?
If so, have you reported them to the Moderators?
Not on the Free Republic, but they have a prominent place among the other Internet kooks. A lot of the time they are clearly paranoids.
That is not hate mongering. Anti beliefs are not equivalent to hate mongering.
Remember that each time a new belief is spawned from a previous one, both sides tend to condemn the other in the harshest terms they can muster, e.g. heretic, cult, apostate, demonic, anathema, etc. And often those harsh terms become part of their official documents. Clean hands are rare.
When the "open" thread debate crosses the line from vigorous disagreement to hate mongering, then we moderators intervene. For instance, we do not allow Islamic fundamentalism, Christian Identity (or other white supremacy beliefs), anti-Semitism, Jack Chick materials, the false Jesuit oath and so on.
Like pornography, moderators know hate mongering when we see it.
Check out any of the old Mitt Romney threads. There are virulent anti-Mormons on FR and a host of others who mock the beliefs of the LDSers. To deny that is to be disingeneous.