We have such a small sample size that its kind of pointless to say they do or don’t break up in any particular manner.
Its kind of like plucking a grain of sand off a beach and proudly declaring that grains of sand are shaped like this.
That's the problem with most answers in astronomy.
I have long proposed that if we detect a “killer” asteroid that is going to strike the Earth at some time in the future, that rapid spinning could be used to remove the threat. This would be accomplished by landing several small ion engines on the asteroid in a pattern designed to rotate the asteroid. Rotate it enough and you can alter the trajectory. Rotate it even faster and you can spin it apart.