I think you missed his point; the title says it all: Same way people argue political matters, tools discussions (politics) can go out of hand with arguments created in the moment to save you own argument - thought it's a created thruth. People do it all days; basically people in general don't want to be wrong so they create a reasoning/world of assumptions were their argument holds.
Actually, he pointed out that even if it turns out that the tool (or political party) doesn't in fact endorse said position, the person will still think the position is valid.
> people can be convinced that a view is correct by being told that their political party endorses it, even if their party actually opposes it