When you want to lead a public organisation you give up certain freedoms in order to serve the interests of the organisation you lead.
I also think it's quite funny seeing the letter from the people who are being accused of being a mob. It's a relatively unemotional statement of their case with citations pointing to the underlying issues they're referring to. Where the reponse, which is meant to be the balanced rational people supporting an unfairly attacked man is highly emotive, poorly argued and doesn't actually address half the issues RMS is being criticised for. Some of the most obvious arguments against RMS leader the FSF actually come from the letter defending him.
>His words need to be interpreted in this context and taking into account that more often than not, he is not looking to put things diplomatically.
Well maybe that's not a good trait for the leader of the FSF.