well thats a little extreme, me personally, id shoot em in the leg so we can have a nice long conversation
killing them seems a little overboard but the guy probably wasnt a trained killer and didnt yell that he had a gun. he was probably scared shitless on the other side of a door finger on the trigger shaking like a leaf, but when they came at him, "boom!" so i dont blame him, just his lack of training. TBH its irrelevant whether he had plants or not they could have came to rob him for dozens of reasons.