Samurai, in the old days, used two swords: a katana and a wakizashi. Having two blades in your belt meant you were a fully fledged warrior.
But at some point, we threw away that pride, lost the belief that we should protect others, and all that was left was the one weapon to protect ourselves....
This might have been the final comedy chapter of Gintama. I hope you guys enjoyed it - I sure did. I should have expected Sorachi would comment on the cast of movie