I'm not aggressive or even obvious about this disposition, I just gently steer clear of violating it. I feel the same should apply to companies, fine if you want to make a stand on some political issue, but don't make a show of it, because it implies that all your employees should agree with your position.
People in the world have different opinions on things, we need to be able to work with eachother on shared interests without making every place and occasion a battleground. If not in the workplace, then where?
On a somewhat related note, I don't consider my colleagues my friends, or, God forbid, the workplace a 'family'. My relationship to my employer is a professional one, trying to disguise this by intermingling personal feelings can only end in tears, when one day you discover that it was such all along, only you deluded yourself (or let yourself be led) into thinking differently.