But that's a key part isn't it .. "[..] without fear of retribution". There may be reasonable restrictions on matters directly concering another individual, but if it concerns work topics, ideas, objects, etc. one can discuss matters with factual reinforcement.

Why would I be insulted if you argue that a certain idea is problematic and you point out some good reasons to reinforce your argument? I can either agree/accept your arguments or counter or recontextualize/refine. In the end, we can choose to agree or disagree. It doesn't need to be personal or vindictive.