"Ultimately you have to judge any argument by what it says, not who said it." That's not sufficient. You have to consider incentives, motives, history, etc. et

"Ultimately you have to judge any argument by what it says, not who said it." That's not sufficient. You have to consider incentives, motives, history, etc. etc. Arguments do not stand alone in a vacuum, neither do "facts." The selection of facts, the selection of arguments, have everything to do with who says them... and why.