If it’s a burner phone, it can’t be traced. It’s swatting. I didn’t believe that it couldn’t be till my son told me. Thankfully, he’s leaving that profession, soon.
Swatting can absolutely be traced, even when done from a burner phone. It is quite a bit more work than the authorities usually want to do. So, they don't do it.
Which does not excuse those SWAT teams from their atrocious conduct. Every one of those guys should be fired and prosecuted.
Most local police forces should not be allowed to have SWAT teams. They aren't needed as much as they are used, and frequently aren't competent when they are used.