WELL, SHOOT... JUST SHOOT

[Cynical Ninja]

Its unfortunate that there is no practical workable way to make sure everyone with a weapon is also trained and educated on when it is and is not ok to use it. This is one of the points of the laws that need to change, The lawmakers need to put something intelligent in the law such that if you carry a weapon into and initiate a confrontation then you should be responsible for it.
In this case it looks like the dude with the gun took it outside and confronted an old guy that was just wandering around, instead of calling the police.
OK, so the GF was scared because there had been Someone around last week, So what? If the old guy was outside wandering around call the cops.

Exactly, if you are concerned or worried about someones behaviour call the police, they are going to be more qualified due to their training and experience to handle the situation anyway.

If you ask yourself the question “should I get out my gun and do something?” The answer in the vast majority of cases is going to be “no”.