If you find the comments discussed here unacceptable, don't invite RMS to keynote at your conference without an explicit apology and expression of understanding from him beforehand. I'm seriously at the end of my patience with people being unwilling to call others on behaviour they perceive as unacceptable. Either make it obvious or accept that people will treat your failure to do so as implicit support.
Edited to clarify that I think the apology should be from RMS, not from people who invite him to keynote
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