The patriotic epilogue (these are war-time movies, after all) is more humanistic than usual. I think Holmes has been getting into the snuff.
There's a new spirit abroad in the land. The old days of grab and greed are on their way out. We're beginning to think what we owe the other fellow, not just what we are compelled to give him. The time's coming, Watson, when we shan't be able to fill our bellies in comfort while other folk go hungry or sleep in warm beds while others shiver in the cold. When we shan't be able to kneel and thank God for blessings before our shining altars while men anywhere are kneeling in either physical or spiritual subjection.
Mm, mm, you may be right. I hope you are.
And God willing, we'll live to see that day, Watson.