> If the helmet cracked then the force of the collision was transferred to your skull.
This does not make any sense at all. Your skull absorbs some force in all cases. The exact mechanics of what happens are definitely complex, but compressed and cracked polystyrene is still better than hitting your head directly on concrete, just as hitting your head on asphalt is. That is of course leaving aside the question of how much force was absorbed before it cracked and what was left afterwards, but in all cases it's not a binary assertion.
This does not make any sense at all. Your skull absorbs some force in all cases. The exact mechanics of what happens are definitely complex, but compressed and cracked polystyrene is still better than hitting your head directly on concrete, just as hitting your head on asphalt is. That is of course leaving aside the question of how much force was absorbed before it cracked and what was left afterwards, but in all cases it's not a binary assertion.