one of the many things with Batman is that if everything is his fault than everything is within his control, and if everything is within his control than he can better himself (something hypothetically possible) to ensure that no one is ever hurt again.
if it is not his fault then it is not within his control and then there's nothing he can do to prevent it from happening again.
this is why he will always make it his fault and this is why he will always accept any blame thrown at him whether merited or not. his drive for control isn't love of power it's fear of inescapable consequences
