If that is what his ex wife lives he has every right to be that at the appointed time to pick up his son as he explained in the video. He wasn’t just there “ trespassing acting rambunctious “ . You can clearly here him having a dispute with his ex wife and didn’t threaten nor talk to the step dad until the step dad escalated the situation by going to get a rifle.
From that point yes you have a case to make of self-defense, but to ignore everything before that is naive
LOL... you probably though Kyle R. Was guilty too.....