| See if you can get one (just one) player to be an instigator. Whether this involves creating a new PC for him,or just getting him to change up his character a bit, see if you can convince one player to be reckless, impulsive, or overconfident.
Suddenly, every instance of debating either becomes:
Mongo is bored. I charge!
or
Mongo is looking bored. Stop him from charging!
I had one player in my old group who served this function admirably (which is one of the reasons why he's in my new group). I usually didn't have to "send a guy in with a sword", as he was always on the lookout for trouble. This is also much more doable than getting a whole group to change their ways. | 
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