You are attacking the player, not the game. Software patents shouldn't exist. But in reality they do, and as of this moment I would much rather Google own the patent than a troll.
Especially behind real inventors' back.
You can't just dictate your own distorted ethical vision just because you are too big.
Edit: plus I don't even give a shit if they limit their use of this patent to defend themselves against competitor claims. Clearly even in this limited case this patent still would have (a very good) value, so at least propose the REAL inventor to patent it and sell ultra limited right for that purpose for a few millions. Then this would be kind of ethical.