Uhh.... similar? I think not.
Firing a warning shot is not the same as defending yourself against an attack (and we're assuming that Martin was the attacker not because I necessarily believe it, but because the prosecution was unable to prove otherwise). Why was she pointing the gun at her two step-sons? Were they involved in the altercation?
Regarding John McNeil, why did the court reject his self-defense claim?
Regarding the third case, it seems like he probably shouldn't have been convicted, but I'd have to see the whole case.