its all a matter of point of view. IOM say`s its has the right too (cull mutans and cleans them, cull psyers and send them of too ether die for the emperor, do something useful for one of there agensys or become a live long living psy com person and lets not forget. 'all aliens much die" (or expliotend) and and who resist this rightful rule must die
the loyal see this as a state that has been, shall be and must be the way that it is (with minor fights about the how its done)
a follower of chaos might see. untold slauther of friends and famely, taking of there local healer/protecter or whatever els the local wyrd was, killing of a useful trading partner they where using too get by when the imperium wasn`t around too provide. and the brutal overlord that will do anything too say in power!
and don`t bring up the deamons, you don`t play as a deamon so they don`t count. deamons in 40k are just a manifestasion of the warp bond by ether a greater deamon or a sorcerrer.