How do you even stab someone with a samurai sword to begin with? The katana and its family of weapons are designed for slashing, not piercing/thrusting. The blade is far too long and far too curved to be used as a close-combat thrusting weapon, and you're not going to be jousting with one anytime soon either. If they were talking about a to then I could understand stabbing; after all, it's straight, has a nasty pointed tip, and is a bit shorter. But this isn't even a samurai sword, it was used by certain ninja clans. No samurai would ever "dirty his hands" with a ninja's "inferior" weapon.