I know (or at least hope), that you meant this in jest, but hear me out anyway: there is this common perception, that war clears out the deadwood, burns away the dry shrubbery, and after all the killing has been done and done to, fresh minds will spring to life and reinvigorate society. Reality shows a very different pattern, though. Russia tried to bring this concept to life in the last almost four years, lost over a million convicts, misfits and whatnots, and total alcohol consumption went up, not down.
If you send all these "less than average" people to slaughter, you leave behind a lot of misery, which bogs down the rest of society. This "cleaning steel bath" is a dangerous myth mostly spread by people, who think themselves so far above average, that they don't expect to get sacrificed in this madness..