Most rabbits I encounter seem to have some sort of death wish - and it's generally granted via collateral damage. The single exception would be the death bunny, of course.....
I burn them when the mob I'm fighting dies as I'm pumping out one more fire arrow. Although sometimes it hits another mob way off in the distance who hadn't noticed me yet. I burn them when the game decides that the bunny way off to my left is a better target than the mob right in front of me. I burn them when I walk by them with Immolation up.
if it leaves me alone, i do the same for it. if it attacks me i try to kill it. if something else, kills it, i will skin it though.
I try not to kill the bunnies.. but the ones that die accidentally I make sure are not wasted - they would want it that way
Usually they are crossing the road around the farms here, so I nail them with my car. I now consider Rabbits just a bit less smart than a bird. At least a bird knows to get out of the way of the vehicle coming towards it.
We must bow down to our wiggly nosed Overlords!! Boil them! Fry them! Put them in a stew! (a SotA Crafter)
I'm finally getting around to learning moon spells, lately been using animal mez on bunnies and squirrels if I'm in areas with low animal population. I try not to kill them.