The hive want to kill us because it is their mission from the darkness to kill every host race of the traveler The cabal simply plan on overtaking the solar system to expand our empire The vex want to kill us because we don't fit the pattern The fallen want to take the traveler and we are in the way. This is all backed up by grimoire, game theorist tried but when compared to us he simply doesn't stand a chance, the foundations his theory is built on is false and as such cannot stand.