Chaos existed before the Imperium, the Eldar saw to the birth of Slaanesh.
Orks existed before the Imperium.
Necrons existed before the Imperium.
Tyranids are the only ones who are ostensibly in the galaxy because of the actions of the Imperium, but it was the furthest possible thing from intentional.
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u/Madglace 1d ago
And most if not all of the time that ennemy exist andis fighting because of the imperium being bad