"I don't owe a rejected candidate anything ... I don't think this kind of entitlement-thinking will serve you very well." I'm not saying you are morally oblige

"I don't owe a rejected candidate anything ... I don't think this kind of entitlement-thinking will serve you very well." I'm not saying you are morally obliged to, I'm saying it's the nice thing to do. For me personally, being nice is part of being courteous, which is why I used the more general word before.