Well, that's a danger, certainly. But it's not our fated doom. As somebody once said, politics is an important domain to which we should individually apply our rationality. So, we ought to be aware of the danger of making public policy into a team sport. However, rationalists don't have to ignore and avoid politics, but rather must try to look at it objectively. There are tools for this. Explicit models checked against historical data is a good start, as a way of making assumptions transparent.

In any case, to paraphrase Trotsky, you may not be interested in politics, but politics is interested in you. Politicians are the people who tell police and armies what to do. Governments can be benign or maybe not so benign. To ignore politics altogether would not be rational.