This is the #1 misconception about why people are concerned with privacy and it needs to stop. Not everyone who wants to protect their privacy is a criminal. Here are a few reasons you'd want to protect your privacy unrelated to criminal activities. I'm sure fellow HNers could add more to the list.
Private life away from work. Political enemies within the state. Private sexual fetish. Public personality who needs anonymity for some sense of a real life.
Another important one is private life away from family. You're probably thinking I'm referring to a cheating spouse but it's not only that. Many gay or atheist children are thrown out of their house when their parents discover that about their children.
There are many reasons law abiding citizens want privacy online. Please don't paint all privacy conscious people as criminals.
This also can be because I have never been stalked or harassed. If I were to go through that then maybe I would change my stance.
Perhaps if you ever get harrassed, stalked, or have your identity stolen based on information you revealed online you might change your mind.
Plus I am a little optimistic about companies like Google/Apple/Microsoft. The risk involved in invading someone's privacy is definitely not nearly the worth of them getting caught and all the bad press. The ad companies and the government however I don't trust. Because they don't have a face to save. Someone gets busted, they shut down/resign and life goes on.