Unless you do something really major, most f**k ups can be fixed 
Here's the thing:  This idiot who killed all those people is NOT a normal person.  If he wants to kill people, it doesn't matter if he has a gun, a knife, a bomb or poison, he would have tried to do the same thing.  I feel sympathy, shock and outrage over the incident also.  NOTHING makes that right, but just because he used a gun doesn't mean guns are the problem.  I have no problem with what you are saying at all.
I shoot targets, not people.  Just because I enjoy shooting firearms does not mean I also intend to kill people.  I drive a car and I enjoy driving it but I can easily kill people with it also if I decided to.  I am not insane though.