Do you believe violently crazy people should have gun rights? Like that kook who shot Gabriel what's her name. Everyone knew he was nuts, no way should he have the ability to get a gun. Yes, you can't prevent criminals from getting guns but if legal guns are easy to get, there would have been several armed folks to bring him down before he got more than a shot or two off.
Who gets to say who's violent and crazy? Gun control is based on prior restraint ie punishing someone for soemthing the MIGHT do. The constitution doesn't make any distinction among individuals, saying some should have rights and some shouldn't. So until someone commits a crime, then yes they have the right to keep and bear arms, and anyone who wants to infringe those rights is by definition an anti-gunner. Regardless if they only want "reasonable restrictions" and they belong to the NRA or if they believe it's OK for states and localities to pass gun control.