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You want a spokesperson for something they better be worthy of respect. That's their primary function. It's not being a sage of truth.
People listen to those they respect, and his behaviour at times is so out of line that he spends more time destroying his credibility than communicating.
I get that people might disagree with his views, but why would they think he's not worthy of respect?
You want people talking with the spokesperson be rather worthy of being treated respectfully by the spokesperson. People who put the medium (Stallman) above the message clearly aren't.