I was playing through Halo and Halo 2 and it's just... a thing how casually those games shrug off military casualties. you're driving along on your tank with all kinds of marines hanging on it shooting stuff. But, they get shot and killed and fall off and no one says anything. Some other grunt will run up and take their place. Eventually, everyone dies and again, no one says anything. Sometimes Cortana calls for backup and they're all "sure, there are 10 more marines for you to casually walk to their deaths and use as bait! "