I only watched the first video but to be honest, I found it immature and disrespectful. Once the Ron Burgandy clip part started, I turned it off.
I don't think the father is acting, he did lose a son, or is the video suggesting that never happened? I think what we see here is misdirected anger. The shooter is dead so he needs to focus his rage on someone, anyone. I think in this particular instance there were errors made with respect to gun control. The shooter had a serious and documented mental illness that somehow fell through the cracks. This is what the guy should be going after, how the shooter despite all the concerns from this therapist, etc., was able to legally obtain a weapon. He used a handgun in one of the most regulated states in the US so I really don't understand why he's going after the "high capacity" and "assault weapon" angle as neither had anything to do (nor would have prevented) this tragedy. He's fighting the wrong battle, IMO.
I don't agree with a lot of what the father is saying but that stupid YouTube video is not the way to get your point across. (OP I know you didn't make the video, I'm just saying in general)