Instead of flashy rhetoric you should concentrate on the fact that competing implementations is healthy; but the ones that threaten to break protocol are dangerous. That's what sold me.
Competing implementations of Bitcoin, such as Litecoin and Primecoin, are called altcoins because they establish their own independent alternative socioeconomic consensuses/majorities.
Hostile implementations of Bitcoin, such as XT and Classic, are declarations of war because they attempt to threaten Bitcoin's existing consensus-critical distributed ledger.