What a load of total BS and filled with strawmen. The audacity of calling me a liar is an awesome load of pure horse manure.
The tendency to call people liars on this forum is a pet peeve of mine, so I can understand you taking umbrage at it.
Nevertheless, your post packed a lot of falsehoods into a small space. Not lies, but falsehoods.
When confronted with lethal force, you may be able to use non-lethal force. You may be able to extricate yourself with no force at all. i.e. your best option, if it is available, is to run away. Also, just because lethal force is available does not mean it can or will be used effectively. There are all sorts of reasons why you have lethal force available, and yet you cannot stop the lethal force with which you are confronted.
Moreover, if you have lethal force available, you might use it ineffectively. (i.e. there is nothing "assured" about lethal force.) You might shoot someone accidentally, as in you don't intend to fire the gun, but you fire it anyway. You might shoot another "good guy", because you miss the bad guy. You might choose to use lethal force when not necessary, and end up escalating a non-lethat situation into a lethal one. You might shoot a good guy because you misidentify him as a bad guy. Or, you might just shoot someone because he made you mad. In fact, all of those are more likely than that you will ever use a gun successfully to deter a bad guy with a gun.
You may object to that last part, because you are skilled with a gun, or because you aren't the sort to get mad and shoot someone. Pardon my skepticism, but I can't tell you from those other people who don't handle weapons well, who don't take the time to be certain their target is really a bad guy, or even people who just fly off the handle and kill someone because they got really mad. It is unlikely you are any of those sorts, really, but you are indistinguishable from people who are those sorts. Moreover, the probability that you are one of those bad, or inept, people with a gun is greater than the probability that you will stop a bad guy with a gun, so, I don't want you to have a gun.
But I'm willing to compromise. You can have a small one, as long as you don't carry it around in public.
But, I only have one vote, so until I can convince 50.1% of my fellow citizens that keeping big guns out of your hands, your gun is safe. But I bought the T-shirt for the march anyway.