I think you might find what you are referring to is where scientist disagree. I'm not sure how this is problem. As we don't know all there is to know we can never be 100% sure that you are correct.
The problems I antipate on this thread would be best described as competing theoretical standpoints.
For example: I would concider 'depression' as an expression of cognitive and behavioural factors. Other disciplines within psychology would have a different formulation.
But this is not a problem for science. It justeans we don't know enough to be more certain which theory is most accurate.