That's the thing, rabbits must have come to a fork in the evolution road at some point and took a left on "outbreed everything" instead of a right on "outrun". Both things are survival mechanisms.
Thread drift is like going to a bluegrass festival and jamming out in the campground when all the sudden some dude shows up with a flute (really happened). "Yeah, okay, have at it bud. Maybe it'll sound good!" It's not the end of the world.