I believe the point is that while your personal beliefs may lie at any point in some high-dimensional space, if you're getting involved in politics in some anonymous way you should throw all your support behind the single "best" group, even if, like in two-party politics, that means supporting a group you have significant differences with. Non-anonymity (nonymity) changes things, leading to behavior like lobbying multiple parties.
I don't really find it that disturbing, but it does get a little weird when you remember how bad humans are at separating acts from mental states.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.