You do realize the Darkness swallows and consumes everything it finds, right? The Traveler is like an arms dealer, giving weapons to those who have none so they have a chance to fight the Darkness. It's trying to give hope to where there would be none. Like the Fallen at one point... Think about it, why would a beacon or servant or whatever of the Darkness arm civilizations so much? Just for fun? It's detrimental and the Darkness would NEVER give a weaker force or species a chance at life that it desired to devour. The Hive are the embodiment of that very nature. No mercy, no pardon, no exception. You want to live? You better kill your attacker and then dominate thereafter. Even within the Hive these are the rules of life.