Intelligence of Orcs

But if you consider the fact the the very first orcs were mutilated and tourtured Elves, and the fact the tourture often breaks the minds of the victims, then add in the fact that while the later orcs were not tourtured (aside from day to day orcish life) but retained the broken appearance of their forebearers, isn't it possible that they also received the psycological effects of the tourture? That would ensure that their desire to kill things, especially Elves, continued into all the generations, and would stop an especially bright orc from starting an uprising.
Just a thought...