Several different ET races manipulated DNA and seeded different Human races throughout history.
Each Human race has a certain ET race that made them so to speak.
Some human races have negative ET DNA of those they lack sympathy and are jealous of the positive manipulated DNA humans.
You can speculate as to who they are.
Some Human races were manipulated by creator / inventor ET races and of those some have abilities that are a threat to the negative ET's.
They want to breed out that DNA and destroy your bloodlines because of this.
They start wars between your race so that you kill each other.
Some of you are a threat to them and their control.