The Earth was suffering. Humankind destroyed it almost entirely during the pointless wars and the endless hunt for resources. Life was not possible to sustain anymore. Not on that planet, at least.
Anarchy, struggle and fighting against each other... instead of doing the right thing. That was always the nature of humankind.
The humans were lucky. They had a savior. A company called 'Guardians' emerged with enough resources to help evacuate most of the population of Earth. They were heroes. A group of the highest military rank joined the Guardian, and formed the 'military council', to supervise all human activities of outer space.