Conflict with Aberrant Marked – Keith

Gabriel Krotkov asks, "Keith mentioned that the standard houses began the War of the Mark partially to suppress the "source of power" coming from aberrant marks. What economic threat did the aberrant marks pose to the houses? I get that there must have been a popular fear of the real danger posed by aberrant marks, but if that's the inciting factor in the War of the Mark why was the main opposition towards Aberrants coming from the Twelve? Why not a religion (Silver Flame, in the vein of the lycanthropic purge, perhaps) or the secular monarchy?"