I just posted this, in full, to Craigslist politics. Let the hippies mull it over...
They won't. When you hit them square between the eyes with an irrefutable fact that they don't like, their eyes will briefly become unfocused, they'll stare for a moment, then change the subject and begin shouting. I've seen this in in-person arguments over and over again.
There are none so blind as those who will not see.