I was not going to jump into this, but for the love of God people, please learn something about the law. Self defense is NOT a "right," it is a privilege. A right is something the holder bears at all times, to which someone else owes a duty to recognize. A privilege, however, is only invoked if certain preconditions are met, such as the requirement that one must hold a driver's license to be able to use the public roads.
To be able to argue the affirmative defense of self defense, you must meet a certain set of circumstances that typically look something like this: (1) Actual belief that one faced IMMINENT bodily harm, (2) the belief that one faced imminent harm was objectively reasonable, (3) actual belief that the degree of force one used was necessary for the purpose of defending one's self, and (4) the belief that the appropriate degree of force used was objectively reasonable.
This means that it is CRUCIAL that the force used in defense was both proportional and IN REACTION to imminent (as in immediately impending) bodily harm. This goes directly to the heart of the issue of carrying a handgun in ANTICIPATION of a deadly attack. What society risks by embracing a mentality that it is one's "right" to use lethal force on the streets is the potential creation of a paranoid army of gun wielding vigilantes who have a misconstrued conception of the law and who will escalate minor confrontations to a deadly level.
Please turn off the evening news once in a while and do a little research. Violent unprovoked attacks are extremely rare. It is ludicrous to walk down the streets, wielding a gun in preparation for a criminal to jump out from around a corner with a gun of his or her own. A more likely scenario might be a petty thief perpetrating a pickpocket. At that point do you have the RIGHT to take out your gun and shoot the thief? You likely do not, because it was not objectively reasonable to use deadly force in such a scenario.
For your mental, personal, and legal well-being, please just start living your lives not in a state of paranoia, but in a state of cautioned reason.