Swatting is not a “dangerous hoax”. It is not a “prank”. Swatting is attempted murder — in this case, successful murder.
The police are not the target of swatting — they don’t receive the call and possibly break their station with their breach equipment or shoot each other. The innocent people at the address the SWAT team is sent to are the target; they are at risk of property damage at best and getting shot by police at worst.
The swatter is sending 10-60 officers, mostly lethally equipped and expecting a dangerous situation, sometimes including snipers, to the swatting target’s address. This can reasonably be expected to eventually and occasionally lead the the death of the swatting target.