Their business is protecting and saving lives
You know who "protects and saves lives"? Medical personnel, doctors, nurses, firemen, police. Armies do the bidding of the most powerful, which almost always means some very bad days for regular people.
You can dress it up with all the lovely rhetoric you want, but if you listen to the sales pitches, read the brochures, of all that great "protecting, life-saving" hardware at a weapons show, you'll hear about killing people, hurting people, depriving them of life.
We say it to make the young men and women who do the fighting and end up dying or being mutilated feel better, but all that business about "protecting liberty" and "fighting for our freedom" is just a canard. What was the last time in American history when we actually fought for our "freedom"? Now, it's about protecting corporate interests (profits) and enriching the people who make all that "overwhelming firepower".
I wonder what was the last time that one single item at that weapons show was actually used for something that didn't end with regular people being dead or displaced.
Do you really believe that only the "good guys" shop at those weapons shows? That they ask for affidavits that the weapons will only be used morally?