To me, that doesn’t look like a strong defense of the “no politics/religion” policy, because the actual reasons those people were fired seem mostly unrelated and obvious grounds to fire someone, regardless of any particular workplace discussion policy. Deliberate unauthorized usage of the company Twitter account is certainly grounds for firing, as is using company time and resources for a plan to report the company to authorities (assuming the report was frivolous and the employee knew it). I honestly don’t see where the policy about political discussions is relevant here at all.