Very good point.
If we consider the amount of knowledge (or data) out there and how limited the human brain is at processing that data, it's basically like streaming the ocean through a tap faucet. We also have to consider that each individual views the world through a lens of personal bias, which is based on their individual experience. The environment influences an individuals perspective to the point where two individuals can perceive the same even differently.
I believe that in a previous post you discussed the possibility that there is no such thing as a universal truth (big T)? If this idea is correct, then it doesn't really make sense to even try to determine who's idea is right or wrong, but rather to understand each others perspective and possibly find a common ground that works for everyone.
Great message.