That's the active shooter question.
Anybody in the public has the right to use deadly force against an active shooter, assuming the jurisdiction allows deadly force in defense of self AND OTHERS.
Only the police have a right to use force against somebody who is standing down.
Unless the person is there for some nefarious, criminal reason, such as looting, rioting or arson. They would not be entitled to self defense claims at that point, from what I understand of the law in Wisconsin. Basically, if I rob a store or commit other criminal acts, and the store clerk pulls a gun so I shoot him/her, I couldn't claim self defense.
Sort of.
It is possible for both sides to have a valid claim to self defense.
Here, it doesn’t matter what JR/JKM/AH, and GG were thinking, did Kyle feel reasonably threatened with imminent bodily harm?
To me, the problem for JR/JKM/ and AH is that KR never directly threatened any of them. GG can claim that KR raised the rifle in his direction when he ran at KR, but he also acknowledged that KR dropped his aim, only to return it when GG aimed the pistol at him.