What is the alternative? To only listen to certain arguments? Based on what? Your assumptions that the others are wrong? Where do those assumptions come from? A person you trust more than yourself? Why do you trust that person? Because your logic and reason tells you s/he is wiser than you? If it doesn’t, then why? If it does, then why would your logic and reason not also say that it is reasonable that someone out there might possibly have a good argument against a value held by the person you trust? It might be painful and it might drive one mad, but if someone is really, really interested in truth, why wouldn’t they listen to opposing arguments whatever the subject?
Letting everyone’s opinion be aired may not cause the truth to come out very quickly, but only allowing one stream of opinions to be aired is not exactly a better alternative. If one is interested in truth, that is.