Because politics is the mind-killer and almost every single conversation about pickup artistry immediately becomes infested with politically-charged claims.

I actually feel like the last time it came up the discussion was really constructive- what began as a near flame war ended up as a friendly and informative discussion (see, in particular, Hughristik's comments).

It's like that discussion about the correlation between race and intelligence that went to hell in a handbasket not long ago.

In this case the initiator was pretty clearly either biased or unable to communicate his reasons. He also used unsavory tactics. But I thought the discussion outside that particular poster was quite good: fair-minded and rational.