I Was Wrong, and So Are You

I don't understand the methodology undertaken in this study.

The whole point of having political ideologies is that you believe yours is correct.

They asked politically polarizing questions to conservatives and liberals, and each answered according to their beliefs. It's not so much confirmation/myside bias, as it is confusion about truth.

This study required the authors to have objective truth measures for all the questions asked. How were those truths obtained?

It's completely irrational for people to believe in things that are known, objectively to be untrue. Basically all the author has done is shown that politics based on ideology is irrational, since ideologies lead people to disagree with known true facts.