And why hasn't he been fired yet?
Seriously how do Butterfly Swords get only 1d4 damage, the same as a crappy old dagger? The blades are 15-20 inches long, plus the hilt, plus the pommel (used for bashing) - and they weigh only half a kg? Butterfly Swords are serious close quarter combat swords designed to not only to slash, but also pierce.
Somebody seems to to have gotten the Butterfly Sword mixed up with the Balisong, the folding knife. Butterfly Sword stats should be the same as the Wakizashi, it's as simple as that. When is there going to be errata released to correct this gross mistake?