Society changes, but human nature doesn't. Study your history and how civilizations rise and fall. Political leadership regimes go through cycles of amassing power and rigging the societal structure for the gains of the elite at the expense of individual rights and freedom of thought. Such regimes either rot from corruption and inefficiency within, or get overthrown out of dissatisfaction by their own people.
The Constitution was carefully written using the wisdom of history and hardship experienced through fighting off such a tyrannical, abusive regime. It was designed to have meticulously thought checks and balances to keep government power from being too overreaching, implemented through the independent branches of the federal government, states rights, and the Bill of Rights protecting individual citizens from governmental abuse. Believe it or not, the Second Amendment is part of the package and one of those checks because an armed population is a lot harder for a self-serving regime to control (because they can vote with their bullets in a worst case situation).
It is people like you, David Pakman, who think they know better and are willing to throw out the old wisdom in favor of some new sort of banana republic that does not believe in empowering the individual. I don't know about you, but I'd rather live in a society when I'm an empowered individual.