Earlier quoted context omitted.
Regardless of location, Facebook is hiring from demographics that typically don't support Trump. Young, STEM-educated people skew left. If you want Trump supporters to even things out you're probably going to either: A) hire older devs from less traditional software dev backgrounds. B) Still pull from Young+STEM but filter out anyone whose social media indicates them as being left-ish.
Who wants to work for a company where they're living in constant fear of being outed as a non-leftist and losing their job? I get the frequent recruiting emails from FB and (much less frequently) Google, but am really too afraid to pursue them.
Read between the lines: I'm saying that there are a lot of people selecting themselves out of the candidate pool for the large SV tech companies based on the perception of SV corporate culture being promulgated through the media and forums like this one, further reinforcing the group think in those organizations.
That should make you happy.