I'd certainly look at this situation differently if Apple based their firing on claims of harassment. Antonio's email is definitely strongly worded. Though I'd want to look at the series of "unhinged tweets" sent by Moore - my perspective on this is that a lot depends on what Moore sent before this. If it was civil, then Antonio's email goes beyond the pale. If it was comparable, then I see it in a different light if he was met with similar vitriol beforehand.