James and Jennifer Crumbley were accused of having given the gun from the massacre to their son, ignoring the warning signs of his violence. The ruling is set to have an impact much broader than the borders of Michigan, the scene of the massacre.
It is in fact the first time that the parents of a minor who commits a massacre are convicted of murder in a country where 80% of the weapons used by students in mass shootings are taken from the homes of the family or of relatives and friends.