The argument most seem to be making is that burglary is worse than a mugging because the burglar has robbed more people than the mugger.
That's not what I'm saying at all, since there's no way of knowing or inferring that since the situations are deliberately vague. My rational is dependent on the fact that in situation, the original A, no one was harmed, other than psychologically. B, on the other hand, bilked his clients out of money. It leads me to believe the consequences of Bs actions are of greater harm, with farther reach. Both deserve prison time, but on these grounds, since I have nothing else to work with, B should get a longer sentence compared to A.
I'm trying to say that even the threat of violence makes the first crime worse.
I don't consider the threat of violence to be of the same or greater gravity as actual violence, regarding your example. B obviously commits the crime in cold blood, while A kills in self defense. I don't see how you could link scenario A (bob's post) with your scenario if the two situations differ so much, other than setting. A is a crime in bob's scenario, while your A is justifiable.