Nasuverse and Being Selfish

Given the recent event, it got me thinking. Does Nasu have something against actual Altruism?

Not just the event but, the protagonists of so many stories are often only saving the world out of selfish desires. Ritsuka and Shiro being the most obvious examples where it's repeatedly pointed out their reasons for acting are entirely selfish.

Are there any people in this universe that actually enjoy doing the right thing not because it keeps them alive or out of any other goal but, simply because they enjoy helping people?