You're proving my point. It never happens in real life, so it should never happen online.
What makes you think the internet, an international 'area' open to all, is the same as your privately owned abode?
If I went into the street and sprayed graffiti everywhere detailing my name, address, spending habits, interests and interactions with others, and a policeman came and looked at it, you'd call me ridiculous if I got angry that the policeman has looked at it or written it down, because it was in public.
But if the policeman saw the graffiti detailing the plans of a criminal about to commit arson or a shooting or a bombing, and he stopped that man because he had loojed at his graffiti, no one would be complaining.
And should a police officer come into my house with a warrant and seacrch the place, they'd have had reasonable suspicion to believe I was up to something allowing them in to my private home. But if the courtthen found I was Iinnocent of what I was charged with the police wouldn't be using my innocent information from my house against me, because they have better things to do.