We've heard that line before, and it was disgusting when applied to race relations in the USA. But what about in the matter of the liberty movement?
I feel that most in the liberty movement have a genuine and well-founded distrust in their current government and in the political parties. Those who enjoy the conspiracy front harbor the same distrust, so it is logical that both camps would end up in the same places and on the same discussion boards.
There are reasons why the conspiracy theorists would hurt the liberty movement, many of which have already been pointed out: self-implosion by jumping on every theory only with conjecture and without a good basis of fact; allowing the media to get away with portraying the theorists as kooks rather than the concerned citizens that they are; the dumbed-down American public believes everything the media tells them to believe.
Generally I have no problem with conspiracies being discussed on the Daily Paul, but I can sympathize with those who do. But how do you establish the Daily Paul or other liberty site as a "conspiracy free" zone? The only way I see is through mutual agreement, with some other site being established as the place to discuss conspiracy theories.
I really don't see that happening, so whether they help or hurt becomes a moot point.