It is difficult to tell a foolish person the truth. It is difficult to even say the truth in front of them. Some of the people in our families are fools, but we love them anyway. So if one of your family members gets divorced, it makes it difficult to say "God wants us to stay married to one person for our whole lives" without offending someone we love. They want to believe that what they did was for good reason, it was necessary to get divorced. They don't want to hear that what they did was wrong. They want to build around the premise that what they did was right, and they will hear nothing else.