Well, cops can have guns because they go through at least 3-9 months of training, not one week. They also shoot thousands of rounds. I once jumpseated with a capt. that was an FFDO and he didn't even know what kind of rounds he was carrying in his gun??? Those of us who have worked in law enforcement know its just slightly important to know how many and what type of rounds your firearm has<sarcasm>
And from what I've seen working both jobs, there are slugs in both jobs and equally as dumb. In the end, what it comes down to is the ability to take a life up close and personal. I don't care if its a pilot or cop who has the gun, the question is whether or not the person has the balls to pull the trigger and watch someone go splat in front of them.