That depends. If this hypothetical robot was in a hypothetical functional democracy, I'd blame the people that elected leaders whose agenda was to create laws that would allow these kinds of robots to operate. If not, then I'd blame the class that took the power and steered society into this direction of delegating use of force to AIs for preserving whatever distorted view of order those in power have.

I would blame the damned fool who decided autonomous weapons systems should have narrative influenced decision making capabilities.