Positive Unconditional Regard
Positive unconditional regard is a neat thing if we manage it well. Most people facing an active listener think that the listener actually agrees with them, while s/he is only saying "it's ok to have those feelings" and "you are not a bad person even if you've made many mistakes".
However, it does not mean "it's ok to be messed up".
The point is, how do you convey positive unconditional regard without passing the "I agree with everything you say" message?
To tell you the truth, I don't think it can be done. What people perceive drastically depends on what they want to perceive. If they want to hear that their MH professional actually agrees with them, there isn't much that can be done.
Am I wrong?