If a person has a bad behavior, you may understand his action by analyzing what he has done. You may give reasonable understand to how the behavior turned bad but still, you would never do the same. You would be a spectator giving analytical knowledge to the situation. A synthetic understanding would mean that you would be able to do the same as the other person. This is not only a question of analyzing the behavior but bringing aesthetic- and ethical reasoning into the understanding. A synthetic understanding is an physical engagement, a participation into the behavior. Human are not able to have a true synthetic understanding of bad behavior. Human can only have synthetic understanding of behavior we would be able to wholeheartedly imitate and improve. A synthetic understanding gives insight and not only analytical knowledge.