No, you miss the point I'm trying to make. What if the shot WAS justified? The guy didn't misjudge the situation, didn't act impulsivly or imprudently in any way. Beyond the shadow of a doubt the shoot was good. We're only throwing in the weed as an "extra" hypothetical. Would that change your feeling? Again what if it was YOU that was saved by the shoot, would you still want the guy hung out to dry ONLY because of his indulgence in an herb?
In other words you were all set to vote that this was a proper use of lethal force then somehow you found out the guy was a user of cannabis. Be honest now.
The blood runs free, the rain turns red, give me the wine, you keep the bread.