The Asset had had a family once, before the world was overrun by walkers. It had had a wife and a son. They were good people, it was certain about that. The Asset had cared for and loved them very much. When the walkers started popping up all over the globe, they were forced to move from the comfort of their home in the city and into the forests. They never stayed long in one place, constantly moving to evade the creatures that plagued the Asset's mind at night. When they'd found a small group, they'd decided to stay and enjoy the company.
However the enjoyment was shortly lived. Walkers invaded the camp, separating the Asset from its family and leaving it to wonder where they'd gone. After searching unsuccessfully, it eventually gave up and found another group who took it to their compound and fixed it. The Asset was forced to forget its original name and experienced psychological torture as a means to comply to its handlers. They muzzled it, put a tight straight jacket on it, and chained it in a dark empty cell. They took away its freedom and its humanity; in its place, they rammed a soulless, ruthless killing machine that knew nothing more than kill and comply.
If it ever malfunctioned, they'd fix it and make sure it never glitched again. Malfuctions were unacceptable. They only brought pain. The Asset quickly learned to comply and never question its handlers. It had no voice, only a muzzle and instructions. It was a weapon. Nothing more, nothing less.