Starship troopers is a fantastic movie.
You just have to acknowledge that it's a parody piece that (rightly) shits all over the source material for the war worshiping jingoistic crap that it is. :)
Did we read the same book? I took out of it that war is horrible, leaving the lucky ones dead and the unlucky ones in broken bodies and scarred souls, but still a necessary evil to allow the people back home to live peaceful, happy lives. It also implies that drafts are bad and the only soldiers should be volunteers who willingly measure the rewards vs the risk of dying/getting injured, realizing that their sacrifice benefits the whole. Remember that the general feeling of the cap troopers was that they would be happy if the war was over tomorrow and no one was ever forced into a capsule if they did not want to go, and they weren't even punished for doing so besides getting discharged.