If they paid attention to the lectures and read the material, anyone that has taken a microeconomics course knows the concept of minimizing loss, as a common practice in business. When profit cannot be realized, this must become the focus if the business is to remain solvent and prosperous.
Shift this thinking toward the recent shooting at New Life Church, the Colorado congregation that was attacked by (yet another) deranged gunman, armed to the hilt for a little personal war, with people that likely had nothing to do with the cause of the gunman's unhappiness. Then, contrast what might have happened vs. what did, in fact, happen. It is there you will see the value of what having a gun for protection, really means in this day and age.
Meet Jeanne Assam, the lady that in all likelihood saved hundreds of lives in that church Sunday.
Many that are predisposed to being adverse to the licensing and carrying of firearms as well as those that have a tendency to be critical of the Christian faith, will likely be villifying this woman as the days wear on. But, when you do the math and count the heads, be sure you consider the caskets that may have been used in the next few days, in the Greater Denver area.
If this woman had not had that weapon, if she had not been trained to use it, and if she had not been willing to use it, the death toll could/would have been much higher and grief would have been more abundant. As it stands now, only a few were shot before she could neutralize the threat.
This is something every anti-gun advocate cannot deny, if they have any critical thinking skills.