The targets of this story are not wayward sinners but religious people who do everything the Bible requires. Jesus is pleading not so much with immoral outsiders as with moral insiders. H wants to show them their blindness, narrowness, and self righteousness, and how these things are destroying both their own souls and the lives of the people around them.
Timothy KellerAn idol is something that we look to for things that only God can give. Idolatry functions widely inside religious communities when doctrinal truth is elevated to the position of a false god. This occurs when people rely on the rightness of their doctrine for their standing with God rather than on God himself and his grace. It is a subtly but deadly mistake. The sign that you have slipped into this form of self-justification is that you become what the book of Proverbs calls a 'scoffer'.
Timothy Keller