What would the US Justice department have any jurisdiction over crimes committed via Florida’s 911 system?
The argument could well be made that SWAT-ing is an act of domestic terrorism, which would put the FBI and DHS in the picture.
Apparently, one of the tactics is to call the person being SWAT-ed and that way they are on the phone when they unknowingly respond to the door (or it is forced) with the police under the impression that the person being SWAT-ed has just committed a violent crime and is armed. It is not uncommon for police in such a situation to mistake another object in hand for a weapon, which could lead to the target of the SWAT-ing getting shot.
SWAT-ing could be considered attempted 'murder by cop'.