You're right, "conspiracy theory" is of course a loaded term. But they are conspiracies, and theories about them. We could take the suggestion to say "conspiracy hypothesis" but that means the evidence is even weaker than in a theory.
All on my list have other explanations than those proposed by the adherents of each conspiracy theory--but it seems believers in these theories don't even try to look for information contradicting their view. Yet this is what Bush does--refuses to even look at adverse information--and we slash him to ribbons--rightly--for doing so. So we should not do the same.