We should not insert political issues which are not relevant to the topic, because the more political issues one brings to the discussion, the less rational it becomes. It would be most safe to discuss all issues separately, but sometimes is it not possible, e.g. when the topic being discussed relies heavily on evolution.

One part of trying to be rational is to accept that people are not rational, and act accordingly. For every political topic there is a number of people whose minds will turn off if they read something they disagree with. It does not mean we should be quiet on the topic, but we should not insert it where it is not relevant.

Explaining why X is true, in a separate article, is correct approach. Saying or suggesting something like "by the way, people who don't think X is true are wrong" in an unrelated topic, is wrong approach. Why is it so? In the first example you expect your proof of X to be discussed in the comments, because it is the issue. In the second example, discussions about X in comments are off-topic. Asserting X in a place where discussion of X is unwelcome, is a kind of Dark Arts; we should avoid it even if we think X is true.

This post is mostly directed at newbies, which aren't supposed to be trained in trying to keep their brain from shutting down whenever the "politics" pattern matcher goes off.

In other words, it could cause some readers to stop reading before they get to the gist of the post. Even at Hacker News, I sometimes see "I stopped reading at this point" posts.

Also, I see zero benefit from mentioning global warming specifically in this post. Even a slight drawback outweigh zero benefit.

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.

(I don't necessarily disagree with your points, I was simply making a relevant factual claim; yet you seem to have unhesitatingly interpreted my factual claim as automatically implying all sorts of things about what policies I would or would not endorse. Hm...)