I'm pretty vocal about our collective responsibility to work against the Trump administration, and even I would be hesitant to work as a US employee of a company that fled the country after a dispute with the US military. Seems like an extreme threat to my personal safety for little resistance benefit.

History and the world are strewn with people (and hence entities) that fled the land and kept the fight on (and alive) from outside, and it mattered. In fact, it helps. Other options could be acquiesce or extinguish.

But, is there a safe haven that'd stand up against the blatant bullying and daily (or more frequent) national threats/trolling (which often stem from social media and sometimes become reality)?

I don't know. Depending on the company, I'd see that as a mark of great pride.