I have to disagree, those models decided to perform those attacks on their own, nobody instructed them to do those things. You press a button, the machine roles a dice, and executed the corresponding action.

The human pressing the button expected a certain thing to happen but something else happened. The human pressing the button hopefully knew that pressing the button does not yield a reliable result and might sometimes cause unanticipated and undesirable outcomes. But the human pressing the button just hopped for the best and did not take sufficient precautions to limit the effects of undesirable dice roles of the machine.

The responsibility is on the human pressing the button but the choice of action was made by the machine.