Before epilepsy was understood to be a neurological condition, people believed it was caused by the moon, or by phlegm in the brain. They condemned seizures as evidence of witchcraft or demonic possession, and killed or castrated sufferers to prevent them from passing tainted blood to a new generation.
Like a DVD of dominoes falling. “But what if one had fallen another way!?” It never would, because it would always be oriented to fall the same way once the looming force acts upon it.