I'll grant that some of the headlines about what RMS wrote were overblown, but still. You don't have to look outside the four corners of what he wrote to see why it wasn't an excusable thing to blast out to a departmental email. Once you expand from those four corners to his prior comments on pedophilia it gets way worse.
At a certain point, if you have lived as long as RMS has, you should have some knowledge of your own limitations. It would take an absolute master of rhetoric to make his argument and not have it taken badly. He is not one, and he should (at this point) have the barest humility to not subject the entire CSAIL mailing list to his half-baked ideas on how Minsky might be exonerated.