> they don't care about protecting the privacy of the people they're investigating.
That seems like an overbroad generalization. All else being equal, I'm sure the police don't want to compromise people's privacy. To be sure it's not their top priority, and if they had to choose between missing important data and dragging too many innocent people into an investigation they will probably err on the side of too much data.
Even if the police don't much care about privacy, there are a lot of people who do. For example, there's no way a court would let any of this subpoenaed evidence into the record unless it was specifically relevant to a charge being brought.
That seems like an overbroad generalization. All else being equal, I'm sure the police don't want to compromise people's privacy. To be sure it's not their top priority, and if they had to choose between missing important data and dragging too many innocent people into an investigation they will probably err on the side of too much data.
Even if the police don't much care about privacy, there are a lot of people who do. For example, there's no way a court would let any of this subpoenaed evidence into the record unless it was specifically relevant to a charge being brought.