Is the fitness value of grasping tools greater than that of grasping wrists? I don't know. Is either behavior an exaptation of the other? I don't know. Does rape and slavery precede or follow tool use? I don't know. Either way the answers don't seem trivial. We may descend from tool users who also rape and enslave, or rapist slavers who also use tools. Understanding more of that should inform our social engineering.