Speculative fiction has always been allegorical. The alternate worlds, be they in the future or some alternate plane of existence, are meant to illuminate and comment on our own when the culture of the current moment does not invite the sort of commentary the author is looking to make.
There are great films that depict the horrors of war and honor those who sacrifice themselves as part of it. Saving Private Ryan and Fury come to mind. There are many as well about civilians who sacrifice money, career, and even lives to promote the progress of a cause or idea greater than themselves. Sacrifice is a noble thing. Of the one who sacrifices his life, the Bible says there is no greater love.