Biased reasoning is ideologically symmetrical.
Sharing a quote that I've thought seemed to provide important insight into the matter of truth or whatever:
'In our time, must we not face the possibility that the human mind as a social fact might be deteriorating in quality and cultural level, and yet not many would notice it because of the overwhelming accumulation of technological gadgets?"
C. Wright Mills, THE SOCIOLOGICAL IMAGINATION, 1959
And C. Wright's little book has several other useful thoughts to ponder. My PhD advisor always noted that one should try and always open a state with " I think..." rather than "I believe...". With the former it requires the conversation to hopefully proceed on a "factual" basis...with the second opening, the listener etc. can then simply reply, "Well, this is what I believe"...or "Well, I don't believe that".
The first opening might lead to further discussion and analysis...while the second simply stops dead.
Just saying, GRL (UNC '65)