The people have taken God for granted. They have begun to view their sins as acceptable. God has delayed venting His wrath, giving them every chance to repent, and they have taken it to mean there is no wrath at all. They've taken Him so much for granted, they don't even notice that He is no longer among them. They no longer listen to His prophets but have decided to embrace those false prophets that tell them what they want to hear, "You're fine! There's no need to repent. He's not a God of wrath. Don't worry about your sin."
Disaster looms on the horizon when God's people mistake grace for a lack of the need to repent.