Why is that a problem? If they want to send a message to a lot of people, their front page would be the best place, wouldn't it? God forbid you get a little bit of human rights activism with your search results...
There's a big difference between sending messages to text editor users and a logo on a website. Note that the logo is always there; it's just a little different this time.
Every google doodle is telling you google's stance on something. Google's doodle of MLK the other week told you their stance on black rights. How is this any different, except for the fact that gay rights make you uncomfortable?
I find it horrific that you consider your rights to be personally violated by your making use of a free, non-government-controlled, non-required public service.
I find it also horrific that you make a false parallel to text editors which also have demonstrable 'political' (as you've employed the term) positions.
