Ok, so let's say there is a circumstance and a process by which they obtain justification from a judge, in the form of a warrant. Then they execute the warrant

Ok, so let's say there is a circumstance and a process by which they obtain justification from a judge, in the form of a warrant. Then they execute the warrant on the wrong address. Why should a cop enjoy immunity for an unjustified felony trespass and property destruction just because they were justified at another address? That's the kind of problem we have now. It's not that cops can't get a warrant for what they do. It's that they are not punished for the stuff they do without a warrant, that you and I would (and rightly should) be punished for.