Reading the letter, what surprised me was how political it was, framing everything as a "left vs right" cultural fight. I think if it was up to me I'd probably fire anybody on either side of that debate who started circulating shit like this. As soon as you're on that level, nothing good is going to come of it and you're just going to make a lot of people angry, which is very bad for the business in a lot of different ways.
The workplace is no place for politics like this. If you are going to strictly stick to narrow issues that are relevant to the job, then maybe, but as soon as you're writing a 10 page manifesto with phrases like "the Left's affinity for those it sees as weak" or "some on the Right deny science" or "the Marxist intellectuals transitioned from class warfare to gender and race politics" you are way out of line. It doesn't matter if you are correct or not, politicising your workplace in that way shows a stunning lack of judgement.
The workplace is no place for politics like this. If you are going to strictly stick to narrow issues that are relevant to the job, then maybe, but as soon as you're writing a 10 page manifesto with phrases like "the Left's affinity for those it sees as weak" or "some on the Right deny science" or "the Marxist intellectuals transitioned from class warfare to gender and race politics" you are way out of line. It doesn't matter if you are correct or not, politicising your workplace in that way shows a stunning lack of judgement.