It's no different than the contents of your home. Obviously we don't want police busting in to random homes to search, but if you're the suspect of a crime and police have a warrant, it's entirely reasonable to enter a home and search. I guess it can't necessarily help clear you up like an alibi would, but if the party is guilty is could provide things like more certainty, motivation, timeline of events, etc.
I think people conflate the two. They hold that certain things should remain private under all circumstances, where I believe the risk is a large dragnet of surveillance that affects everyone as opposed to targeted tools to determine guilt or innocence.
Am I wrong?