Gang culture and gun crime NEEDS addressing, but it always did, and it has nothing to do with crazy people going on rampages. This is the problem, politicians are being given an easy way out, ban the M4 copy the kid used, everyones happy, nothing is done about ghetto's, nothing is done about gangs, the murder rate/gun crimes won't change much at all... psycho's will still go on rampages, using other guns, or other weapons entirely and nothing will change.
people need to focus on two separate issues, and not let politics package this up in a "we've identified some stupid reason this happened, will fix this little thing and pretend everythings better" bow and not go after the fundamental issues underneath.