Yeah, it usually seems to be presented as an inevitability - by the time you realize that you've caused your future, it's too late to change it.
I remember the Ahriman novels having survivors from a Chapter that was declared traitor for no apparent reason... except that their fleeing to the Eye and turning to warp powers to survive ended up causing their Chapter's destruction in the first place, when they run into the Inquisition earlier in the timeline.