As based as Hadrian, Trajan and other emperors were, they were still white and therefore still had that weakness of goodness and empathy. Romans gave everyone they ruled every chance to submit to roman rule, accommodate them, they even offered the fucking jews to add their disgusting god to the roman pantheon, to be recognized as one of the official gods of the empire, but no, its the jew vey or no vey. Sure, as with many things white people used to be best at conquest too, but the weakness of not finishing the enemy so you have nobody to complain later always bites us in the fucking ass. Whether its romans not finishing the jews no matter how many times the filth revolted, or americans not finishing native americans or niggers once they were done with slavery. You leave your enemy alive, you give them the opportunity to complain and guilt you later.