@Savage - who posted above - makes some very good points especially re the possible contradiction in the requirement to cite sources when posting but also the clear (and marked) staff preference not to have to fact check or truth check.
Actually, I would agree with this: If the staff do not see it as their function to truth check, or fact check posts or threads (a position with which I disagree, as my posts on this thread have made clear, - I'm an historian by training, and I have a possibly unnusual and unnatural respect for facts - but it is not my forum, and I don't get to make or enforce the rules), then, I would concur - at the very least, in the interests of internal consistency, with
@Savage's suggestion - replace the requirement that sourcing be required in PRSI with an observation - a disclaimer - that it is not the task of the mods to check facts, or confirm truth, (otherwise posters will seek the support of mods as referees) and that those who post there do so, in essence, at their own risk.
For, it is a contradiction - and possibly, an unnecessary complication - to expect posters to support statements with sources, citations, proof, when the mods make it abundantly clear that fact checking and truth checking or confirmation is not a part of their brief.
Likewise, I think that the idea of a possible prefix ("alleged", or "potentially misleading") for threads an excellent one.