How about responding to the argument?
what argument specifically?
Well, since you're opposed to discussing the gentleman in the video, How about this one:
People kill people and criminals will get [their] hands on weapons and use them on an armed or disarmed population. Only difference is that criminals will have to think twice [before] trying to commit these horrible acts of violence [against an armed populace]. Disarming the population will only make us less safe and more victims of criminal violence.