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It's not so strange if you believe that reason isn't a sufficient basis for determining values. It allows for arguments of the form, "if you value X, then you should value Y, because of causal relation Z", but not simply "you should value Y".
Debates fueled by ideology are the antithesis of rational discussion, so I consider its "ineffectiveness" in such circumstances a feature, not a bug. These are beyond salvage because the participants aren't seeking to increase their understanding, they're simply fielding "arguments as soldiers". Tossing carefully chosen evidence and logical arguments around is simply part of the persuasion game. Being too openly rational or honest can be counter-productive to such goals.
That depends on what you gain from a solid understanding of the subject versus what you lose in sanity if you fail to correct for your biases as you continue to accumulate "evidence" and beliefs, along with the respective chances of each outcome. As far as I can tell, political involvement tends to make people believe crazy things, and "accurate" political opinions (those well-aligned with your actual values) are not that useful or effective, except for signaling your status to a group of like-minded peers. Politics isn't about policy.