Banned because you weren't exactly hiding it. Shooting people for questioning an inquisition which serves a dead emperor, geez.
Banned for tarnishing His ultimate sacrifice. [Side note: I'm actually more of a Chaos person but psssshhht]
HEEEEREEETTIIIIIICCCCCC YOU ARE BANNED FROM THIS EXISTENC, FOUL CREATURE! All hail the Necrons. Biggest pieces of space Egyptian cheese in the lore.