Oh? So three against one is considered a fair fight even though they invaded the house? The homeowner was wrong in defending himself against the three? So what if he used a semi-auto hand gun; would gramps complain?
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Gramps is obviously a life long whiner that passed on his morals to his issue.
“AR15 gave him an unfair advantage over the three burglars.”
Yes it did and that is the way it should be. I have absolutely no fear of an AR-15 in the hands of a law abiding citizen. I will do nothing to warrant him shooting me. I will invite him over to my private shooting range on my property to shoot with me.