You have an unrealistic view of the world if you can't see why a single sentence from over 200 years ago must be interpreted within the context of our modern society. The founding fathers planned for that, which is why the Judicial Branch exists within the checks and balances of the government. The Judicial Branch's job is to interpret laws and the constitution in the context of a given situation.
Additionally, you skirted around one of the biggest examples of ambiguity in the entire constitution: What does "Arms" mean?
The second amendment was important because it gave American merchants in the 1700's and 1800's the explicit right to equip their ships with cannons and, if they could afford it, escort their merchant ships with fast, heavily armed ships equatable to military warships. Remember, getting jacked on the high seas was such a threat back then that the US had to go to war with the Barbary States because of rampant piracy out of Tripoli. Thusly, we have no doubt that the original definition allowed for artillery and emplaced guns. We've just opened the door to a legitimate conversation about whether I should be allowed to install mortars, AT guns and AA guns in the backyard of my suburban home.
Beyond that, "Arms" is short for "armaments" and, by definition, that includes ICBMs, chemical weapons, and nukes. These are doomsday weapons that were never covered by the original intentions of the founding fathers.
And there in lies the reason for interpretation: If we take the 2nd amendment word for word and apply it to the modern day without any sort of interpretation about the original intent of it, we should all be able to have have our own personal nuke stockpiles.
Now you might say I'm being ridiculous and that my logic is outside common sense. I would agree. But if "Arms" doesnt cover all armaments, where do we draw the line?
Tanks? Well, the original use did cover war vehicles...
Just firearms? Only if we take the modern definition of the word.
You cite the 2nd amendment and say "I should be unrestricted in my ability to own and carry a handgun", but the guy down the street cites the 2nd amendment and says "I should be unrestricted in my ability to own and carry chemical weapons". If that's not a compelling argument for interpretation, then I don't know what is.