They will crawl over their dead brethren to get to your food. If your food is outside, they will rummage around in your pack just to whiff the air. They will crap in your Sierra cup (does anyone carry one of those anymore?) if you forget to invert it, or in your spoon, or play King of The Hill on your ass if you sleep in the shelter.
"Revenge." Great observation. If you take traps, you will be kept awake not only by mice, but by the sounds of your own revenge.
There are better things to plan for in arranging a throughhike -- like knowing where all the AYCE are. Go for that.