No. Not everyone contributes to the discussion. Some people have malicious intent. Others are just ignorant. You cannot deal in absolutes. I work in the sciences. If we were to consider every crackpot's solution to the hardest problems in math/physics, we would waste our lives in folly and never get anything done.

No, what I'm saying is that you can't have a discussion between two groups of people and then through the back-door one side tries to get the other to subconsciously accept their principle of 'absolute free-speech'. You both have to be capable of determining whether a belief is sacred or a shibboleth to you and be able to meet half-way.

If you don't do this, you'll be starting on the wrong foot.

Also, in order to have a moderate discussion with less shouting, it's not a good idea to have it be a free-for-all where anybody can speak. You need people that are willing to negotiate their beliefs with each other.