I wonder...does the degree of latitude granted for legal uses of firearms expand the circumstances under which people will be motivated to use firearms illegally? For example - and yes, I know it's not a perfect analogy - where a speed limit was 50mph and people typically drove at 60mph, is now 60mph and people typically drive at 70mph.
As far as I'm concerned, George Zimmerman should have been convicted of manslaughter, if not second degree murder. There was no justification for him shooting Trayvon Martin. He did not need to accost the kid, no matter what he suspected.
Here in Canada, this case was very controversial:
Shooting of Colten Boushie - Wikipedia
I believe Gerald Stanley was guilty of manslaughter, or at a minimum, criminal negligence causing death. Whatever illegal activities Boushie and his friends were up to, his shooting was unjustified. Stanley wasn't even charged with unsafe storage of a firearm.