86 I sometimes wonder why, in light of this, it took so long for the Church unequivocally to condemn slavery and various forms of violence. Today, with our developed spirituality and theology, we have no excuses. Still, there are those who appear to feel encouraged or at least permitted by their faith to support varieties of narrow and violent nationalism, xenophobia and contempt, and even the mistreatment of those who are different. Faith, and the humanism it inspires, must maintain a critical sense in the face of these tendencies, and prompt an immediate response whenever they rear their head. For this reason, it is important that catechesis and preaching speak more directly and clearly about the social meaning of existence, the fraternal dimension of spirituality, our conviction of the inalienable dignity of each person, and our reasons for loving and accepting all our brothers and sisters.
Source: Fratelli Tutti (Vatican.va)