Sure, but what is the limit? To a lot of people, abortion is directly equivalent to murder. Should it be expected that they say "If you are pro-choice, hand in your resignation?".
I don't have a good answer, but just supporting a candidate seems like it should not be enough. The email, in my eyes, was threatening to someone who had voted for Trump, regardless of the policies they support him on. That feels wrong to me.
I don't understand how people justified voting for Trump to themselves without holding views I find abhorrent, but I'm not omniscient. At some point you have to say that if almost half of the voting population support someone, their views are at least common enough to take pause.
I honestly don't know. Before all this, I'd have agreed with you. I thought that people who would be willing to support such - in my view - horrific policies would be few and far between, and would write them off, but clearly this is more widespread, we have not progressed as far as we thought.
Maybe it's worth offending on average half of your customers and losing staff to reject Trump's politics, but I have to ask if that's effective if this is where we are at. It's all good and well to stand up for your principles, but does it actually result in progress?
Defending your employees who might suffer as a result of the policies, 100% - it would be unconscionable not to, but the way the email was set up made it more than that.