Um... no. Not the same thing. I am honestly surprised that you would even purport such a notion, as you seem to be an intelligent man.I think it is a good analogy.
Both describe a person 'getting what they have coming to them' according to the beliefs of someone else, and ignoring what the law says.
When we decide to exact our own brand of justice on a person we consider a 'bad guy', there is no real difference between a robber whom we dispatch rather than let the law deal with them, and a late-term abortionist whom we dispatch rather than let God deal with him. It's all about dealing him the justice we feel he ought to be getting.
Same thing, pretty much.
The reason that it is a bad analogy is that the man in the pharmacy was attacked and held at gunpoint and was able to respond with force and in the heat of the moment, did something very foolish. This was not a premeditated action and in the phamacist's mind, the downed thug still represented a potential threat to his person. The pharmacist did not have years, perhaps over a decade, to reason out his crime.
The person who shot the clinician, on the other hand, premeditated the crime, planned it out, and executed it without direct provocation and without any threat of harm to himself by the clinician.
Thus the pharmacist is guilty of taking defense of himself and his property beyond a reasonable limit while the other is guilty of premeditated murder. There is a huge difference.
Personally, I place the actual (not legal) responsibility for this one entirely on the robber. Once you decide that you are going to use force or the threat of force against another person, you run the risk of that person being crazier and better armed than yourself. You accept that risk the moment that you perpetrate the act. Once they drew their guns and threatened the pharmacist, they accepted that risk. Turned out that the pharmacist was equally well armed and able to use his weapon to greater effect than the robbers.
Kind of like playing chicken with your hot rods. You run the risk that neither of you will blink and end up in a head on collision. Both drivers 'get what they deserve' because they perpetrated the crime of stupidity. This is not justice, simply cause and effect. Same with the dead robber. Cause and effect.
Justice is left for the court to decide.
Daniel