How to debate without looking things up

When it comes to the big decisions, opinions, and principles, most people really fundamentally don’t care about objective evidence, facts, numbers, efficiency etc. What people do care about is morality, doing what’s good, right, just, etc. And their ideas of what is right and wrong are formed during their childhood. Evidence is only sought selectively, and for the purpose of reaffirming the preconceived beliefs that childhood trauma has already instilled in their minds.