Is there anything that would prevent another Google (or Facebook, etc.) employee (with a lower salary or thinking Google is not for him anyway) from going completely by the letter of the law and suing when fired? That employee could make a more limited case that Google's diversity programs discriminate against white or Asian men in hiring, complain about diversity training sessions, say something about agreeing with Trump's policies and with the conservatives (to make it more explicitly about political activity), write about organizing other employees who agree, make sure to file an NLRB complaint before getting fired, bring up some IQ meta-analysis studies to make sure it's scientific, yet controversial enough to get him fired, state that he's happy to work with Googlers of all sexes and races and that he holds their skills in high esteem and hopes everybody else does too (to make a firing based on the employee manual less credible), use email (because that's what's specifically in the law), run it all through a lawyer first, and don't do any post-firing interviews as Damore has done.
Wouldn't that cause huge headaches for Google and other tech companies? If such emails get leaked, the bad PR would force Google's hand to fire him, as happened with Damore. It seems like companies that want to see themselves portrayed as socially progressive might end up between a rock and a hard place.