Crush all opposition
Look, the fact is that Google started out a small, uniquely effective search engine. Because they were effective, and did the job better than any other search engine, they turned into a mighty corporate powerhouse. Mighty corporate powerhouses want more money. That's to say, however much money they've got, they want more. It's their purpose. Looking after the customer and providing a reliable service might have got them where they are, but when a company is the size of Google, and is trying as hard as Google is to crush all opposition, those necessities become millstones. Expensive millstones.
People still seem to see Google as this brave-little-firm-that-could, and they play on the image of being the Little, Friendly, Local Guys. The truth is that they left all that behind years ago when they started making real money. Google has become a juggernaut and it's not going to stop - and your security is only a concern as far as it affects Google's ability to make money. Even then, merely searching on Google doesn't cost you anything, so aside some bizarre workings of the peculiar Internet economy (where I know money can appear, move, and disappear like virtual particles in physics) that won't make Google much money. They've got to find other ways of making you profitable - and don't they just.
I'm as guilty as anyone. I fell out with Google when they bought the Deja Usenet archives, and again when they subjugated Blogger. But I still use them, because unfortunately they are the best search engine. But given the storm of cookies I'm subjected to by their main site, I'm starting to ask myself if the risks are worth the benefits.