apologia

An apologia and an apology usually aren't the same thing. An apology includes an admission of wrongdoing, but an apologia rarely apologizes in this sense, instead seeking to justify what was done. So, for example, in 1992 some of the books published for the 500th anniversary of Columbus's voyage were apologias explaining why European powers such as Spain acted as they did in the New World: because, for example, the Aztecs were a cruel people, practicing human sacrifice in grotesque ways (victims were skinned, and their skins were worn by the high priests), and Christianity hoped to reform them. Of course, the Spanish Inquisition was torturing and executing nonbelievers at the same time—but that would be the subject of other apologias.