They may be right to deride the memo. They are not right to deride anyone who wonders whether writing something like that, and sending it internally to a mailing list intended for discussions of this subject, is maybe not an offence that deserves the outrage it garnered. Nor what basically amounts to a social death sentence.

Otherwise I'm with you until your last sentence. This is not a kind of human nature that I think we should accept. Especially because, as you say, it just doesn't work.