One side or both can be more right than wrong about any given issue. However, its very hard to imagine both sides being mostly about disputed issues but easy to see that they can both be more wrong than right, assuming there is an objective (not personal or subjective) measure of right and wrong (there isn’t).
Political disagreements are a lot like that. They are usually based on (i) little or no evidence and (ii) subjective personal perceptions of reality and personal ideology or morals. That makes most political disputes unresolvable and pointless. Americans have been bickering for centuries about what the Founding Fathers would have wanted or done about most everything. Those disputes will continue for centuries.
Evidence of innate, unconscious human irrationality about politics from academic research is overwhelming. Humans see and think about the world and issues through a lens of personal ideology or morals and unconscious biases. Unfortunately, personal lenses are powerful fact and logic distorters. When experts are carefully scrutinized and evaluated, their ability to see future events is poor, about the same as random guessing. Some people are exceptions and have real talent, but for the most part expert predictions of future events and policy outcomes are useless.
“The electoral cycle is one reason politicians shun RCTs. Rigorous evaluation of a new policy often takes years; reformers want results before the next election. Most politicians are already convinced of the wisdom of their plans and see little point in spending time and money to be proved right. Sometimes they may not care whether a policy works, as long as they are seen to be doing something.”Evidence from social science research is clear that politicians and experts who are convinced of their own wisdom are far more likely to be wrong than right most of the time, if not always. Finding a solution to that little self-delusion conundrum is a necessary prelude to implementing the obvious, simple solution.