Hm... Would be interesting. Maybe if you DID somehow manage to get past the whole thing you'd end up getting a secret ending where Puro's like "Ah, what the hell, I'll just use a gun." If we're going the unfair route, that is.
Personally I kinda want a ending where we end up at least beating Puro in some shape or form, but I understand that other people miiiight want the player to be held responsible for being a jerk. I guess it depends on how you want your player base to feel like. We can go being a certified bad guy or a certified dead man.