At least I am in very good company on the comments. The major portion of them are lambasting the show. 
Congratulations ABC 20/20, you have just presented yellow journalism at its best. In your ‘If I Only Had a Gun’ episode there were so many of the situations that were edited in a way to heavily slant toward an anti-gun agenda. It is clear your intentions are to promote guns as evil. Watching the show left me very disappointed in your claim of fair and honest reporting. While there were some truths broadcast, I can’t even begin to list all of the inaccuracies in the episode. It was clear your intent was to broadcast them as accurate, when it is known by the producers and staff they aren’t factual, but will hold the viewer’s attention from the shock factor. Let's take one example, your ‘Shooting Under Fire’ scenario.
Pitting rank amateurs, who have little to no firearms experience, against a highly trained tactical police instructor is asinine. The attacker KNEW who the armed person was and where they were sitting. The poor defender didn’t even have a chance. It’s like putting Diane Sawyer against Michael Jordan in a dunking contest; you have rigged the contest to guarantee the outcome will be as expected. It was clearly evident this situation was set-up to purposely fail.
I challenge you to try a real experiment with an attacker who has average marksmanship skills, similar to the shooters involved in the recent mass shootings. Pit them against a person who has a concealed carry license and has regularly practiced his/her skills, such as drawing from a concealed holster and shooting at moving targets. THEN you will have a more realistic scenario and a fairly level playing field that a person who is armed would likely face.
Let’s see some true reporting on issues, and not something that reeks of personal agendas and tries to unfairly sway viewers on a subject.