They just want to get bigger. That's all. They work with smaller web publishers, and offer a way to make money. Publishers offer space for them to run their ads on relevant sites. If however google changes their mind, I hope that there is a plan B for publishers if that is the onlt stream of revenue they have.
You have to deal with Google. But don't get too emotional. They are a complex network with very little human interaction. I don't think people should take everything so personally.