You don't even need those things. Intelligence and practice will suffice, even for "purely rational arguments".
Defending Truth makes debates easier to win, but isn't a necessary or sufficient condition.
Also, I suspect that Truth isn't always easy to discern, especially in a world where we're immersed in tradeoffs and complex systems.
Yes and I think that's because they entail criticism, which is used to attack ideas and people we don't like. Whereas creating something worthwhile is about discovering or perceiving something already inside the mind that we do like (and therefore cannot seriously attempt to criticize). Building a family is an attempt to create something worthwhile.