Everyone's conclusions about the truth of reality are based on reason and evidence. The problem is that everyone determines the reasonableness of the limited evidence they have according to their own subjective experiences, needs, desires, and by their own chosen criteria. And of course most of us think the other guy's methods are wrong, and so then is their concludion.
And then we all argue about who is right, endlessly, learning nothing.
If we would all just realize that we are somewhat right and somewhat wrong, and accept the other points of view as amendments, we might actually broaden our understanding.