Zombie Cliché Lookout:

Whenever characters try to make a major decision, they’re always sharply divided into at least two camps with the most polarizing figures leading the opposed sides. In almost no time characters will be entrenched, committed to a particular course of action and unwilling to consider a single other option or even listen to obvious flaws in their own idea. Thankfully, a third party is often handy to throw off the balance, or at least help calm things down for a few minutes.