<font color="blue"> Following that logic..........a tractor is useless for working unless your butt is always in the seat.
A gun is a tool just like all the other tools you have. It doesn't have to be in your hand 24/7. It just has to be accessible when needed. </font>
Hmm. I usually make a conscious decision to use a tool. I decide when to use my tractor, to use a hammer, or to use any other legitimate tool. If I wanted to use a firearm as a tool to produce meat, that would also be a conscious decision.
But, I'm not aware of anyone who made a conscious decision to be attacked, and therefore determined the appropriate time to have a firearm in their hand to defend against that attack.
Your comparison of a tractor to a firearm would be appropriate if someone else made a decision and ordered you to "plow instantly, or die!". Then, you literally would have to have your butt planted in the tractor seat 24/7, or suffer the consequences.
Having a firearm "accessible" even 6" from your hand is useless if someone else sees your weapon, decides it is a threat to them, and fires first.
There is no defense against psychopaths, drunks, or someone with nothing to lose. They aren't going to wait for you to acquire your "accessible" tool. Fortunately, most of us come across those people about as often as we come upon someone who orders us to "plow instantly".
A firearm would be an effective tool for personal defense if you find a buddy with a similar weapon, stand back to back, and both slowly circle, with your weapons cocked, alert for such an attack. Even then, it would be a gamble, unless you are willing to fire first. And, even then, it would be useless if your attacker was concealed. Maybe if you cleared a field of fire about 2,000 yards in diameter and circled in the center of it...