Seeing how the quickly the comments in this thread have devolved into calling conservatives all kinds of derogatory names is a good example why conservative Twitter employees might be afraid to express their opinions. The place of my employment, like most tech companies is overwhelmingly liberal. I dont even identify as liberal or conservative and I am afraid to express any opinion that is contrary to liberal thought. The problem is not that I may have a minority opinion at work, it's how common it's become with people on the left to try and ruin those who hold the "wrong" opinions usually by trying to get them fired and going on social media to call them all sorts of nasty things. Sadly I think my anecdote is more of the norm than the exception in liberal dominated spaces.