Compare these scenarios:
1 a cop is passing by your house and sees you commit a murder.
2 government finds out from your phone's GPS data + public camera face recognition that you committed a murder
3 you admit to a murder on phone with an accomplice
Why is one way of collecting evidence any better than the other. If you commit a crime, you should be convicted. Just because you are able to hide certain types of evidence today does not make the crime justified.