Anything that requires hiding your tracks must have something ilegal about it.
This. Is. So. Wrong.
This is hypotetically, but here goes:
A man is quite the avid viewer of adult porn. He likes especially to see petite women in action. He has quite the local collection of such women on his computers, and he frequents a lot of such websites. HOWEVER, he's NOT a pedophile. He's not into underage women, he just likes them petite.
So, one day, because a co-worker just hates this guy, he puts a box with usb-sticks with child porn in this mans garage, he then makes a call to the police. The police finds the child porn, then proceed to search the mans house, they also get permission from his local ISP and google to find out everything about his web surfing habbits.
Would his posession of said movies and/or search history strengthen his case?
What if he did not keep any local copies, but cleared his internet cache every time he'd watched those sites, but the law enforcement were still able to find his history through his ISP and google.
The man who had a hobby that was not illegal would then possibly be in deep shit. On the contrary, if he just visited disneyland.com, whitehouse.gov and so on, that would not have been to his disadvantage.
This is an extreme situation, but point being that collecting and storing information about surfring habbits and online behaviour could be saved for ages, and it could be used in the future to hurt you. Imagine political candidates digging up dirt about their opponents using employees at ISPs and google.
Some people do things online that they're not wanting the public to know about. This doesn't mean they're criminals by any means.
Would you feel confident about being spied on everywhere? You already are to a certain extent. Credit card purchases are registered, your phone tells where you are, cameras film you many places where you go. But all of this happens 'silently'. If someone followed you around with a camera, I don't think you'd be too happy about it. Or if everytime you drag your card, a big red alarm goes off screaming 'privacy violation'!
Personally I enjoy very much being able to walk wherever I want without anyone knowing about my whereabouts, and I wouldn't mind surf without anyone knowing about which sites I visit.
The fact that I enjoy privacy, doesn't mean that I am a criminal or up to no good.
You won't find much if any pictures of me online, and you won't find much if any personal details about me online, if you look up my phone number, you will not find my resident address. I'm very much a geek though, and I like to play with technology, but I want my privacy, and there's nothing wrong with that.