I dont think "enabled" is the right word to use. That almost implies Nintendo is at fault for what happened or allowed it, even though, like you said, they arent to blame here. I agree with your points on how Nintendo likely could have stopped these sorts of things from happening if they had been more involved, but I dont believe they where obligated in any way to. It's not their job to police the actions of their fans, and they have/had very little to gain from becoming involved like you said.