"I like revenge, it's usually rather simple and rather simple to thwart. If you're tip toeing around why I choose to continue fighting since the war is over, it's simple. The peace needs protecting, my partner needs a strong sword at his back, and I need to fight. It's my purpose now."
He had a fond relationship with revenge. Revenge was his reason for fighting in the war. Revenge and Justice. He'd been unable to achieve the first, but the second... The second was much more important.