This shit needs to come to a screeching fucking halt. It was only a matter of time before someone died over 'swatting', and now we're here.
I don't completely fault the cop, insofar as the situation they thought they were engaging was very intense. That being said, there ought to have been some form of non-lethal response that could have been a first option here.
That kid who gave the false address will have to live with this over his head for the rest of his life, now.