This is a strawman I'm very hard pressed to find anyone in HN at least who would deny Goolgle's right or another other party's right of writing a rebuttal to his claims. A free and open internal debate is exactly what Damore was trying to start. Firing to me at least is not speech, it's an inherently violent act.
It's not a strawman if plenty of people in this comment section are making the exact argument. And if I can't fire an employee for being hostile to my other employees, then I do not have freedom of association.