It's no secret that Levi Ackerman led a terrible childhood in the slums underneath the capital. He had to fend for himself ever since he was still a small boy and more often than not, he had to turn to crime just to survive and live for another day. In his youth, violence was not only a means to an end, it is basically a day-to-day lifestyle for Levi. He wouldn't hesitate to beat up or even kill someone if he thought it was necessary to do so.