Excuse me? Doing it for honor and valor?
They were doing it to save middle earth from a tyrant who would have enslaved everyone under his rule.
That was one of Tolkien's concepts, that a king should protect his people and lead by example. There is no battle in which Aragorn didn't lead from the front.
The 4th age was one of peace and prosperity. Please share the source for the peoples of middle earth living in squalor.