First video is pretty dumb, he's trying to compare two statistics that are actually compiled differently. Violent crime in America is what, three or four offences? Here, or the UK it encompasses a lot more than that.
Second video, well, from this thread it would seem the 'anti' people are more targeting the need for someone to own assault rifles, automatic rifles, I guess.. Big guns. Because as long as people say 'guns stop crime' for, every single story posted, unless I've missed one, that backs up the argument of guns stopping crime, has been a small handgun.