I think you are right and it's probably the most plausible answer. But in the spirit of interpreting the parent comment with good faith, help me walk through a thought experiment:

Try getting a job or a promotion with any VC backed SV company while having a Twitter bio that indicates you voted for or support Trump. Not quite willing to do that? A bridge too far? No prob. Instead, just put that you support the 2nd Amendment. Or the military. Or law enforcement. Or smaller government.

I dare you...