"a well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
I believe this means: Because a well regulated militia is necessary to the security of a free state, the right of people to keep(own) and bear(possess) arms shall not be infringed.
So, people have the right to keep, and bear arms whether we already have a militia or not; it doesn't differentiate. If a person is required to buy a license or permit for a firearm under threat of inprisonment, fine, or confiscation of said firearm...that requirement is unconstitutional.
Some people argue that assault weapons are not needed, but the drug cartels and thugs have them. We need to level the playing field; we can't go back in time and make assault weapons obsolete. As long as there is demand, there will be supply. So, ordinary citizens should be allowed to buy assault weapons if they have the will and resources(money) to do so.
In my opinion, if Ron Paul became president, he would eliminate all gun control laws and he would decriminalize illicit drugs such as marijuana, cocaine, etc. Then, there would be no more all-powerful gangs with guns as there are now. Gangs would see their market share plummet, along with revenue. This would happen as these drugs are mass produced by private industry.
Sadly, however, I can't see this happening anytime soon.