- See if you can find reasons for rejecting it. If you don’t, others will.
This is good advice IME. Get well acquainted (like REALLY well acquainted) with opposing viewpoints, such that you could argue them better than their proponents. See also "Argue Well by Losing" by Phil Haack [1].
Somewhat relatedly, the ancients viewed Rhetoric as the purest expression of intelligence. It required you to have deep knowledge of a topic, including all arguments in favour and against (implying deep empathy with the audience), and the ability to form coherent and meaningful argument. Modern political "debate" is ludicrous in comparison.
[1] https://haacked.com/archive/2013/10/21/argue-well-by-losing....