I think that it was intended by the founders that it be every American's responsibility to own and know how to operate military grade weapons. Like the original Swiss model that they copied from...
I also think that damaging ideological ideas that have been proven ineffective or in opposition to Life, Liberty, and the Pusuit of Happiness; like insane liberalism and socialism/communism -should have been criminalized. Don't get me wrong, I believe in the 1st amendment too, but I guess what I'm trying to say is that along with freedom comes responsibility. One thing I've noticed with alot of the 1st amendment crowd is that they all want their right to say or project- via art or music whatever they want, but they largely reject whatever consequences that might bring. Gangster rap anyone? How has gangster rap which glorifies criminal behaviour ever been a positive or productive element to a functional society? Bottom line is everyone wants their rights, but how many actually want the responsibility that comes with those rights?
The 1st amendment is there to protect the speech that people don't want to hear, even if the PC crowd wants to try and shout it down/try and take away that right.
I agree, responsibility is the price of freedom, and when people start trading freedom for security and giving up their personal responsibility (in favor of protection from the govt/the nanny state) there are problems.