No, in fact, I don't think LessWrong should discuss any issues at all. The point should be that we discuss rationality and learn it and get better at it. Then we can go out and make our own decisions.
If we decide what's rational by treating each subject in turn, we will never be done.
The reason to discuss it is that one of the strengths of a rationalist website is (more) rational discussion of issues in which there is a high degree of irrationality (e.g- politics). To the extent people on such a site are more rational they are more likely then politicians or political debaters to get accurate answers to the problems on which there is public debate.
Today is the midterm elections in the United States, and I am not voting.
For the vast majority of elections, voting is irrational, because the individual's vote is proportionately very small. This means it cannot have an effect on the outcome.
There are, however, conditions which can lead to voting becoming rational, and these are: