1 Kings 14:9

But hast done evil above all that were before thee: for thou hast gone and made thee other gods, and molten images, to provoke me to anger, and hast cast me behind thy back:

Jeroboam did evil above all who were before him by going and making other gods and molten images, leading Israel into idolatry and provoking God to anger by casting Him behind his back in turning away from Him. His plans brought terrible evils, and he was accountable for the results of his course. Those who follow his example are likewise accountable for the results of their wrongdoing.