While I reject the notion of the "bad boy scout" as a kind of myth that's been manufactured by fans and pros alike, I recognize the "good boy scout" that nightwing talks about. The good boy scout is the real sense of what I think of as a boy scout--not the limited definition that the naysayers have imposed on the rhetoric, which equally offends traditional Superman supporters and true boy scouts.
And unlike Grant Morrison, I think that the good boy scout was always a part of Siegel and Shuster's creation. I believe it was their intention to establish a character who would stand for certain moral principles and inspire his readers to good civic action. While Superman challenged the corrupt politicians and bureaucrats in local and national government, he supported the ideals of America--as Jerry and Joe did, being children of immigrants who came to America with a belief in the dream of life, liberty, and justice for all.
Very early in the Superman comics, Siegel and Shuster had set up the Supermen of America--which was a kind of quasi-boy scouts organization intended to promote Superman stories and products, to be sure, but also as a pubic service for the inspiration of boys across America (and in fact beyond her borders). Superman encouraged these boys to be active and to do good things for their community.
Even the early stories have Superman doing this kind of thing. The idea of Superman as a crusader for social justice and the idea of Superman as a boy scout are not mutually exclusive--they are one and the same.
To do this kind of surgery on Superman--to remove the social crusader from the boy scout--is to do violence to Jerry and Joe's concept. Superman may have been brutal sometimes in the execution of his mission (though I don't believe he was the brute that people paint in revisionist history), yet his actions were tempered with a kind heart. His primary concern was to champion the downtrodden--and in the Depression, children had often been the greatest victims.
I came across the poem by Langston Hughes
"Let America be American Again" (written in 1938) and I found in its irony something that could apply to Superman. Superman is really fighting for an ideal that was never entirely realized, yet it's a dream that he has--or rather his creators have. A dream where every man and woman has equal standing. It's ironic that a man with the greatest power is working to give power to those that don't have it. But that's the Superman story.
It reminds us that one can be ironic and yet sincere. We shouldn't confuse this with sarcasm. Irony was always an aspect of Superman--from his winks to the reader to his choice of secret identity to his mythic nature as both the most aliens of aliens and the most American of Americans.