The Constitution would be millions of words if it included all "rights." The issue is whether or not the government could or can REGULATE the right. The answer, for centuries, was "yes." 
And I think it's inarguable what the intent was when one considers the "militia" reference. 
The Constitution isn't a bible, finally. It was created by mortals and it's been amended many, many times. I suppose someone could look at the shocking mass murders and weapons' murders in this country and think guns aren't the problem. Those people, however, are hopeless. Literally.