The idiocy here consists of the claim that there are only two categories, facts and opinions.
Not all truths are facts.
A fact is something that can be demonstrated objectively.
Sorry, but “all men are created equal,” while a truth in which I believe, is just not a fact.
The Founders said they “held” to this truth. Which is to say, “to have in the mind or express as a judgment, opinion, or belief.”
Not all truths are facts.
The Founders meant that phrase only within the context of all men being equally graced with natural rights. Since you can't remove it from that context, if you believe in the existence of natural rights, it is, indeed, a fact.