Obligatory Godwin: Hitler probably thought he was doing The Right Thing, too.
Mother Theresa believed that suffering brings you closer to god. Sure, she were courageous and tried their best to help people, but that was probably more inspired by actively seeking suffering (and helping other people suffer) than altruism.
But it's absolutely on par for Catholicism (or guilt-based Christianity in general). Declaring her a saint was perfectly reasonable.
Mother Theresa believed that suffering brings you closer to god. Sure, she were courageous and tried their best to help people, but that was probably more inspired by actively seeking suffering (and helping other people suffer) than altruism.
But it's absolutely on par for Catholicism (or guilt-based Christianity in general). Declaring her a saint was perfectly reasonable.