George Zimmerman is a good example of bad problem

[gejohnston]

6. how so?

Getting out of the car was stupid, but the actual use of the gun is a different issue. I someone larger and stronger than I is beating my head in the sidewalk, I would do whatever I had to do to survive.

8.) No one should carry an unsecured gun (except in a locked case, unloaded) when outside of home. Guns should be secure when transporting to a shooting event without demonstrating a special need. Their license should indicate training and special carry circumstances beyond recreational shooting (security guard, etc.). If you are carrying your gun while under the influence of drugs or alcohol, you lose your gun and license.

How well do you actually know about this case? What I know, I didn't get from the media. I actually watched the trial. In this case, with all the facts being the same, Zimmerman would be dead or a vegetable. The eye witnesses who saw Martin beating his head in the sidewalk called 911, which is why the cops showed up in less than a minute after the shot. Martin would be in prison.
http://www.democraticunderground.com/?com=view_post&forum=1172&pid=193413

New Jersey has laws similar to what you describe. That didn't work out so well for Carol Bowne did it?
http://www.courierpostonline.com/story/news/crime/2015/06/04/woman-fatally-stabbed-berlin-twp/28461361/

Your proposals might affect the few accidents and acts of negligence and would certainly stop people from defending themselves, a fundamental human right. Would it affect most of the murders in the US? Not close. Most of them are criminals killing each other. Most of the murders, crimes in general, are committed by very few people. A study in Redmond, California, found that ten people were responsible for over 100 of its murders.