Even when it was too late, never before six months, they also did not warn other races about the danger of contact in the human atmosphere, which at that time, was full of deadly viruses and bacteria, both for humans, that some were vaccinated, as for other alien races that were not vaccinated either.
Until the first contact and the migrations, the galaxy and the universe in question, had no history of diseases, viruses, bacteria that were invariably deadly, and that took the name of the human race to the so-called race not allowed in part of the universe outside, being vetoed the entry of the human race in certain civilizations, keeping them isolated and motivated, being the causes of the isolation of humanity, which had several races that did not sympathize with the human race.