Squirrels and raccoons are wildlife.
Keeping wildlife as pets is generally not legal.
Squirrels are just bushy tailed tree rats, rats are not prohibited or require permits in any state. The law is idiotic and killing an animal because the owner didn’t have papers is idiotic and spiteful.
The animal wasn’t killed because the owner didn’t have papers. The animal was killed because it was on video several times biting it’s owner, and you cannot test for rabies without killing the animal and examining its brain.