It's possible for the official leaders of a movement—even a righteous one—to completely miss the point. Meanwhile, it's possible that outsiders actually are better at understanding the movement’s mission. Jesus emphasizes faithfulness to his way over membership in the group. Moreover, in the case of the movement that Jesus was ushering in, those who harm or hinder children on their path are condemned in the strongest terms, while children themselves are held up as models of the true kingdom.