I think that the reason the DDR did that was because of their power was already slipping. If they massacred a lot of citizens, they would probably have a revolution on their hands… They practically already did.
It’s a difficult comparison to North Korea because the regime is not in that situation. The situation is more nuanced than that. I elaborated on possible motivations for using nonlethal force earlier... In the case of North Korea, they also might prefer to not kill citizens who they use for labor.
I wasn’t intending to discuss specific events or political situations, though. I meant to merely touch on the political dynamics of non-lethal crowd control.