Who is guilty of felony murder in these scenarios?

[I spent the winter writing songs about getting better]

Two scenarios:

1-Person A is the driver for a drug distributor (Person B). He drives Person B to a location to meet a trafficker bringing in some products. Person B gets into an argument over payment with the trafficker who gets very angry and the trafficker pulls out a gun and starts threatening him. Person B kills him with his own gun.

2-Person C is a drug dealer who sells illegal drugs for which possession is a felony to a woman at a party who is Person D. When leaving the party Person D is quite inebriated on the drugs and enters a dark road where she is assaulted by a rapist. Despite her state she's able to fight back and ends up killing the rapist in self defense.

The fact that all of them could be is an example of how messed up felony murder statutes can be.

[I spent the winter writing songs about getting better]

I don't understand your reasoning.  Person A and Person C didn't kill anyone so how could they be guilty of murder?  Person B and Person D both committed non-violent felonies and I think felony murder only applies to violent felonies like rape and arson.  Maybe I'm wrong, but I think that's the rule.

There's been cases of people who didn't kill anyone being charged with felony murder. Things like two accomplices burglarize a house, the homeowner catches them and shoots one who dies, the surviving one is tried for the murder of his accomplice since the law states that they are responsible for any death done in commission of a felony.