> Believing a colleague when they come to you with ANY complaint does not mean you're going to pass judgement, or you even have to. It means listening and doing that in a way that does not discourage future complaints.

Your attitude towards them -- listening etc -- is a completely orthogonal matter to whether you believe in the truth of their claims.

There seems to be this wishy-washy notion of "belief" that's causing confusion in this thread, where "believing" is equated to "not being judgemental".