I'm generally not a big cop defender, and he fucked up and he should no longer have a gun for his job, but this internet wannabe caused this. Looking at this objectively, I would go after the caller, big time.
Sure, not arguing that. He should go to prison for life in my opinion. But the cop is supposed to use his weapon responsibly, regardless of whether the assault is for a real or a bogus reason. If the SWAT attack was legitimate, we would be blaming the cop for irresponsibly killing an innocent. This is no different.