I can see where he is coming from, though. I mean, sacrificing himself for the possibility of keeping more of his men alive. You know, Griffith is so damn interesting. You can see bits of his ruthless nature in how he handles his enemies but, so far, he seems to more or less value his soldiers. But, at the same time he sees them as tools or, at least, not as equals.
Edit: Love that scene where Casca is questioning Griffith about him selling himself to the count. How he digs his nails in his arm to the point that he's bleeding. You can tell he hated it but, at the same time, he feels he needs to do it. To make all the deaths he's responsible for "worth it". At least that's how I felt about the scene.