Yep, you summed it up just right.
NORMAL human beings will not let petty arguments escalate.
MOST people have the self control not to pull out a gun.
The problem is there are over 300 Million people in the U.S. (If that's where you are from). Give guns to most people and that small percentage of people that WOULD let things get out of control WILL NOW have an easy time taking it to that level.
I am not a gun control advocate. I'm just pointing out that if you take all of the times that people get heated and out of control in the entire U.S. in a single day, or lets say in a week, think about adding a gun to that equation. You don't think the percentage of shootings would be higher?
Again, that's not a reason to ban guns, I was just making a point. If you want to fight for less gun laws, you shouldn't just completely ignore or refute the point I'm making, but find a way to reduce the number of shootings/killings that occur.