@Poseidon,
It is one thing to rely on facts, and this can be done in many situations, but entirely another when, under other more unusual conditions, the fact of the matter is unclear. In the latter case, depending on the horizon from which one is considering the instance, one must be able to find a way to isolate its static presence from everything that adheres to it. It may be that one can never say enough about a fact to exhaust its being, but one must be able to "say the truth" about it as far as one can go.
Very often, philosophical debates are about such facts and their meaning, or whether the rules and procedures ascertaining the facts in question are genuinely applicable. Even if there be agreement about such facts, another area of disputation can arise about how these fit---or not---into the universals we employ to help describe them, that is, methodological arguments.
Isn't what counts here a certain openness, a intellect of good will ready to at least consider a different perspective? One may, of course, be unconvinced about a position; but by understanding it in a sympathetic way, does this not deepen or expand our own position when it is included?