Do you have an example of someone actually saying their deaths are their fault, or are you just railing against comments that were never made?
Your analogy is flawed. Yes, at any given moment something bad can happen to you that you did nothing to cause. That's true, but that's not what happened here. Assuming the man in this story was telling the truth, those women were being evil and malicious towards him. Their actions didn't warrant a death sentence, but let's not act like the chick just opened her door having done nothing at all to that man and he killed her "just because." Again, we can acknowledge what she did without acting like her actions justified his actions.
Look at Dos comments where he says the mothers share blame. That's what people have been responding to