You would not be thinking about any of this if you were attacked, or if someone broke into your home, or if someone were trying to kill you.
If you have reservations, don't carry a gun.
Over 2 million people are still defending themselves each year against criminals, that hasn't changed much, I doubt it ever will. Your state laws still rule...don't let this latest bit in the news get you too shook up. Since they over charged the guy, he will probably be acquitted anyways, most lawyers are saying it would be almost impossible to get him on murder. If that happens, there could very well be some justified shootings if riots break out and people are threatened. Somewhere right now there is a justified shooting going on, I bet they are not thinking about Zimmerman while it's happening.