Voting with lower standards makes sense if you think he is salvageable and want him to stick around-- but that is not usually how we deal with extremely irrational posters.
He's also provided me with enough evidence that he is not in the business of seeking truth that I have little reason to think even is reasonable-sounding points correlate with the truth. Even outside sources can be cherry-picked. If it were the case that everything here got fact checked or that we could effectively discount the evidence he provides proportionate to our estimation of his reliability this wouldn't be a problem. But as time is a limited resource and we are not perfect Bayesian reasoners it is bad epistemic hygiene to encourage him to stick around. It is worse epistemic hygiene to lower our voting standards for him.
Not to mention the fact that people can't seem to keep themselves from feeding the troll so we end up spending our time talking about whether or not conservatives have ever reinvented language to benefit themselves-- as if that wasn't already obvious to everyone who hasn't been turned into a memetic zombie.
Even outside sources can be cherry-picked.
Sources are OK evidence, people bringing sources are better evidence. When those advocating banning chimp testing focus on cases decades old, that tells me no similar case has happened recently. I don't assume that that case is typical of all chimp experiments, past and present, instead I learn the contrary.
If I find some study indicating that colleges discriminate against high school ROTC members, I don't really have much of an idea if what I stumbled upon is the strongest evidence for that. If sam tells me about it, I am confident no reliable study showing more discrimination has been conducted.
I wanted to bring attention to two posts from Razib Khan's Discover magazine gene expression blog (some of you may have been readers of the still active original gnxp) on the polemic surrounding Pinker's The Better Angels of Our Nature.
Relative Angels and absolute Demons (and the related But peace does reign! )
I generally agree with some of his arguments, but found this quote especially as summing up some of my own sentiments: