> They’d basically have to attack you first for lethal force to be legal.
They just violently entered his home in an effort to attack him, dressed in a way designed to intimidate. These cops were deliberately cosplaying as some sort of a hit squad, they obviously wanted him to believe that they were going to kill him.
It's not like the cops just accidentally went out dressed like that.
This is Denmark, not some Brasilian favela. That type of violent crime extremely rare in Scandinavia. But cops wearing civilian clothes while conducting a raid is fairly normal. Especially when they want to preserve evidence which might be quickly destroyed if the suspect sees them coming.