Yes, I was just going to add the similarity to gun control. But I'd also add that the urge for control isn't limited to states. When these arts were valuable,

Yes, I was just going to add the similarity to gun control. But I'd also add that the urge for control isn't limited to states. When these arts were valuable, masters would be selective and kind of abusive, about who they let learn the secrets. The long, seemingly pointless exercises one had to go through to learn obscure art X were basically tests of loyalty and efforts to instill loyalty.