Firstly, you cant compare speeding to owning a gun, if your arguements were true, then the 150+ million gun owners would all be criminals according to what you just said, why isnt that true? Why do we see nowhere near the deaths you are trying to say should exist in the US because as you label them, they are not responsible?
Secondly, the bill of rights is in place to protect us and our unalienable rights from a corrupt and tyrannical government that wishes to take our rights away.
Thirdly, to revamp the bill of rights because there is a population increase is ludacris, I cant believe you try to use that as an arguing point...
Fourthly, while I dont often say this, the founding fathers in their own right, were brilliant, they knew that unless you gave the ability of the people to be able to bear arms, that a government can and always will erode the rights of its people away slowly until there is nothing left. Assualt weapons are already limited and highly regulated by the ATF, its called the NFA legislation.
In closing, I find it horrible that people wish to give up their rights to own semi auto weapons and large capacity magazines. What would have happened during the Rodney King riots? What would of happened during Katrina? The truth is, that with the governments in ruling today, that if you give up a little bit of your rights, they slowly start to erode them until they can do what they want. Semi auto weapons allow us to protect our families, keep the government in check by letting it know that "we the people" have the same hardware as them and that we will not be bullied like all the other countries in the world have by their unjust governments. If you really want to make a change, lets revamp health care especially when it comes to the mentally ill, the markets, let's really make a change.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.