As a non-american and non-western libre software enthusiast and supporter, I see things from a rather different point of view. First and foremost, I can not empathise with the cancel culture. Not only it sounds too american and political, but it reminds me more of divisions and mob attacks. Moreover, I value less and less corporate supported moves. Not that this letter is corporate supported, but all those corpo signatures, if anything, reduce the credibility of the letter. On the other hand, the letter in support of Stallman, doesn’t carry much or any corpo signatories, which is IMHO its strength.
Now we have a huge division, RMS critics would blame it on FSF, and RMS supportes would blame it on the other side. This is toxic and distructive, no matter which side wins.