In white societies, not long ago, it was considered a despicable act of cowardice to sucker-punch anyone, let alone someone who has done nothing to you. The other behavior which, not long ago, was universally consider a despicable act of cowardice is a group of shits ganging up on one person like this.
In Buddhism, self-defense is a virtue, and this includes whole societies defending themselves against POS, like the savages above.
When law courts and governments encourage savagery by sponsoring and permitting it, they define themselves as the enemy.
Oh, one other thing I forgot, allowing rampant crime under ‘color of law’ in days gone by was also considered a despicable act of cowardice. ABN