A well-worn French proverb pronounces ‘tout comprendre c’est tout pardonner’ (‘to understand all is to forgive all’). Is forgiveness the inevitable consequence of social scientific understanding of the actions and lives of perpetrators of serious wrongdoing? Do social scientific explanations provide excuses or justifications for the perpetrators of the actions that the explanations purport to explain? In this essay, I seek clarification of these intertwined explanatory and moral questions.