It wasn't meant to persuade the leader into agreeing, but more of a SHUT THE FUCK UP comment that would also impact on his troops. The leader was going to kill them anyway because he's shitting himself, but perhaps the grunts that work underneath him have a few more functional brain cells. (His 2nd-in-command seems to be brighter, but no less narrow minded)

It's s smarter thing to say than their feeble responses, which was all I was hoping for.