The death of your father must have been horrendous ad_o! I agree with you and the author. There is no moral difference but the moral luck approach does seem to address the paradox.
A friend of mine was killed by a single punch thrown by an idiot trying to impress his girlfriend. The idiot was jailed for 4 years because it was a reprehensible but not intended action. There was no previous to indicate that he was a 'bad person'. Some of my friends thought it was too low but then on the basis of intention we would lock up everyone who has ever thrown a punch for as long.
I am in the position of Night Blindness in relation to that scenario. Given my size, I am conscious that a single punch could well be serious even if it is in retaliation.