In your example you looked at sources from two different sides of the debate and correctly identify the omissions and irrelevant information.

To me that says that looking at the two different sides and judging their arguments to arrive at the truth works.

A final test would be to see if your arrived truth is close to reality, without relying on human observers. This is done by using your truth to make predictions and see if those predictions come tru. To see if your model of reality has predictive power.