What Jeroboam did was sinful. And it caused Israel to sin. The people came to worship the statue at Bethel. They went all the way to Dan to worship the statue that was there.
When he had torn Israel from the house of David, they made Jeroboam the son of Nebat king. And Jeroboam drove Israel from following the Lord and made them commit great sin.
But Jehu was not careful to walk in the law of the Lord, the God of Israel, with all his heart. He did not turn from the sins of Jeroboam, which he made Israel to sin.