If you see it from his perspective it is as altruistic an action as is possible for a person to take.

He is providing a services to help people in some day to day way. While he is providing that kindness he is taking the time to save them from being tortured by fire monsters forever. Also a very altruistic action, if he is right about the fire monsters that action is really about the only altruistic action that is not trivial and temporary.

Perspective is important, if he was poking their eyes out to save them from fire monsters that's one thing but feeding people and making sure they are safe and happy seems pretty legit to me