We are in different times and if we are to survive the war between entities we truly don't know about then we will have to team up with the hive. The Cabal have great war tactics but they're numbers are not enough. The Hive live by sword logic; in a sense for the years that we have been guardians(veterans) we have our own sword logic as well. Defend humanity. And yes, maybe our thought process has changed over years and what we think about the perspectives of how we live our lives and what it means to be guardians but still all we do know is war. We have teamed up with every race and if we are to survive we need the Hive. But if they turn we shoot em