The topic of evolution, unlike the topic of climate change, is entangled with human psychology, AI, and many other important topics; not discussing it would be highly costly. Moreover, if anyone on LessWrong disagrees with evolution, it's probably along Newsomian eccentric lines, not along tribal political lines. Also, lukeprog's comments on the subject made implicit claims about the policy implications of the science, not just about the science itself, which in turn is less clear-cut than the scientific case against a hypothesis requiring a supernatural agent, though for God's sake please nobody start arguing about exactly how clear-cut.

As a matter of basic netiquette, please use words like "mistaken" or "harmful" instead of "idiotic" to describe views you disagree with.