A lot of US states having those blanked "stand your ground" laws does not help, which already comes on top of the completely idiotic gun laws. In Germany any sort of self defense must be proportionate to the actual threat. Even if you get physically attacked you aren't allowed to just murder the attacker. And shooting someone would open up a whole another batch of questions, since guns are so strictly regulated (including their storage). Owning a gun + license for self defense reasons is typically very rare and more something for important people.