So, basically,what you're saying here is that mass killings of children is the price we pay for the "benevolent protection of the Second Amendment".

I disagree.  And I think there is much we can do without running afoul of the Second Amendment.  But if you're really going to draw a line in the sand, you've got a fight coming.  And you'll lose.  We can overturn the Second Amendment.  Maybe not in my lifetime, but someday.