Politics just leads to bullying, oppression, and silencing rather than everyone getting together for the love of technology. When politics is involved, people take sides outside of the actual discussions on technology and it just gets in the way.
There are plenty of other forums for these political and personal beliefs.
I've seen really good developers being drummed out and bullied from open source project communities based on nothing more than a political opinion.
Even look at the ex-Mozilla CEO: No matter how much good he did at the company, it didn't matter because of his personal beliefs. It was also a little ironic that so many people that are against the bullying and oppression of people based on their beliefs turned around and did the exact same thing to that CEO.