If a conservative person walked into my office their existence would be a political problem, because none of my coworkers or company leadership accept the legitimacy of conservatism. It isn't that the person's physical safety is in danger (necessarily), but merely being present makes them the subject of politics. And those politics are generally hostile. I have a conservative friend who was qualified for an open position, and I asked her about it, but it was clear there was no way she would even be applying.

Now, I'm thousands of inches away from Silicon Valley, in a much larger town than most posters here. But I think this kind of thinking is toxic wherever you work. If you push out anyone who might challenge the structure (formal or informal) of your company without taking a good look at who that structure is serving, you're going to reject a lot of good people. And you're going to reinforce any existing biases already in the company.