I agree with a lot of the reasons offered.
For one thing, I think you are giving yourself legal protection if you are stopped and are carrying a firearm. Our police will be very happy to charge you with carrying a concealed weapon without a license, if you aren't licensed. It happens all the time.
If you are going to ever carry, getting licensed is simply a must.
Another reason, peace of mind. The reality is there are individuals who are predators in our society. I don't think I deserve to be victimized just because I go out a little late to get a gallon of milk.
Finally, better to have it and not need it, than to need it and not have it.
Oh, and guns are cool!