To take responsibility for one's own actions, good and bad, is something else.
A martial artist has to take responsibility for himself and accept the consequences of his own doing.
There is a powerful craving in most of us to see ourselves as instruments in the hands of others and thus free ourselves from the responsibility for acts which are prompted by our own questionable inclinations and impulses. Both the strong and the weak grasp at this alibi. The latter hide their malevolence under the virtue of obedience: they acted dishonorably because they had to obey orders. The strong, too, claim absolution by proclaiming themselves the chosen instrument of a higher power -- God, history, fate, nation, or humanity.
