Law enforcement can act on that information, but they can do a lot of things. Whether they actually are is a different question.

You're also ignoring the risk here. These devices open up a whooooole new class of mistakes that can be made. There have already been people wrongfully jailed due to surveillance technology.

These systems have provided incorrect data, and law enforcement often misuse that data to stalk, attack, and wrongfully arrest innocent people. Privacy matters to everyone - especially for ones who don't care about privacy.