Contemporary interpretation of the 2nd amendment has led to tragedy today in the mean streets of Chicago and LA, something the founding fathers could not have foreseen.
Widespread gun or weapon ownership was common in Ancient Rome and from there forward. We have the right to be armed to protect ourselves against liberal government, and only secondarily to protect ourselves against common criminals.
As a liberal you will lack the IQ to understand that the Constitution was only designed to protect us from government. In fact, the great fear was that if government were given the power to protect our right to bear arms it would instead use that power to take away our right to bear arms.
Thats is why the Bill of Rights was not included. Welcome to your first lesson in American History.
Ah yes, the much noted paranoia of the backwoods American, who fears the city slicker is going to come and steal his squirrel gun, or whose yet, make him pay taxes.
You will note the term "militia" used in the constitution. This comes from the same root as is in "military", which is commonly accepted to be that branch of government concerned with armed defense of the nation. This made sense at the time, and it does now. What does not make sense is to sell handguns to emotionally unstable kids at gun shows, and then to have the results show up in lurid headlines a few weeks down the road.
Even if we were to take the gun-nuts thesis of protection from government seriously, it stlll would be a non-starter. Ask someone around you who has served in the army how long it would take for a modern military to disarm a bunch of civilians with hanguns and rifles. Widespread gun ownership may stoke the perceived John Wayne image of a few inmature individuals, but its only real effect is widespread tragedy.
And if you are referring to the British Bill of Rights of 1689, it was one of the major sources of inspiration for the US colonists when framing the constution, among others.
And this is our second lesson, isn't it?