The Destruction of Laish

Judges 18:2-10, 27

In Judges 18, the Danites and the priest they consult sound confident that what they are doing has God's approval. However, the surrounding context reveals that neither the Danites nor the priest are paying any attention to what God wants them to do. Judges 17 tells the story of Micah and his priest:

1-2 Micah reveals to his mother that he has stolen silver from her.
3-4 Micah's mother gives the silver back to Micah, telling him to make an image and an idol out of it, which he does, in violation of God's command (Ex 20:3-4)
5 Micah installs one of his sons as priest, in violation of God's command that only Levites could be priests (Num 3:10)
7-13 Knowing that priests should be Levites, Micah convinces a young Levite to live with him and be his priest, serving in his household shrine

Thus Micah and the Levite, though they claimed to be following God, were in fact worshipping false gods. Chapter 18 shows that the Danites were doing no better:

11-17 The five spies return to Micah's house with 600 armed men and steal Micah's gods and idols
18-21 The priest protests the theft, but consents to go with the men and serve them instead
22-26 Micah confronts the Danites, who threaten to kill him and his family
27-28 The Danites destroy Laish, a "peaceful and unsuspecting people" that is isolated and thus unable to receive aid
30-31 The Danites set up the stolen idols as their gods and worship them

Since the Danites and the Levite priest were all following false gods, they would not have been in close relationship with Jehovah, the same God who had threatened to destroy all of the Israelites for idolatry (Ex 32:8-10). Thus their statements that they had God's approval were false.