I was thinking the same thing, Apognophos. Any man who would say that publicly I would call a coward publicly. I think if it actually happened, the man would find his conscience kicking in, especially if he had the means of stopping it.
You're right about your Dirty Harry Complex observation as well. There have been police officers who have killed in the line of duty. A few days later someone comes up to him, treats it all like a big joke and the officer knocks the guy down. I met a guy in Cancun, a retired police officer from the Bronx. He was going in to a 7-11 or something just as a crook was coming out (he'd just robbed the place). The guy shot him once with a .357, but the officer deflected it and, pulling out his own gun, shot the guy several times, fatally as it turned out. As we left the surf, I could instantly see the damage. The bullet had torn down his leg, lengthwise. The power of a .357 is incredible and he had profound scarring and a debilitating limp. Later, when he and his wife had dinner with me and mine, he told me that he suffered several years of nightmares and insomnia over the shooting. He went through both physical and emotional therapy and his wife told me what she went through -- his spontaneous weeping and changing moods. Military people don't tend to suffer the same, probably because they're trained to fight. He also wasn't religious. I think people who are (and who don't think such are going to be annihilated or spend the rest of eternity in flames) tend to look at it in a different light.
The scriptures do not say, "Thou shalt not kill." They say, "Thou shalt not murder." Big difference. Murder is the taking of innocent life and, I think, applies to animals killed for sport as well as people. There are some people who corner wild hogs using dogs. Then, when the hogs are trapped, they jump in and stab the beasts to death using long, sharp knives known as "pig stickers." In short, these people delight in the screams of the animals and their blood when they could have just as easily shot them. They then take photos of themselves holding their bloody knives, with their clothing drenched in blood and looking like something out of a horror movie.
A number of years ago, I used an illegally-carried Rossi 88 stainless steel 3-inch .38 Spc to spook off about six very intimidating...ummm...young men after taking a date to a late night play in a seedy section of Washington, D.C. My date knew one of the people in the production, so when we got out the place looked like a war zone. I had parked in an underground garage and when we got to my car, there were only two -- mine and theirs. Not a good sign. The young men were standing around and seated on their car like they were waiting for someone -- likely the owner of my car. My date was very attractive and here I was dressed in my best suit, overcoat and some spiffy shoes...an easy target with only about twenty bucks. Enough to satisfy one of them, perhaps, but six? My car door was locked and these guys began whispering to each other. As they walked towards us, my date got behind me and dug her fingers into my arm. At that point I just turned, faced them, and pulled out just enough of my gun so that they could see it. And when they did, it had its hoped-for results. They slowed and, after a very brief staff meeting, they glared at us and began back for their car. Fearing they might be going back for weapons of their own, I quickly unlocked her door, let her in, then got myself in. Having been as cool as glass moments ago, I was now so nervous I could barely get my keys in the ignition and beat a hasty retreat. The point is: I DIDN'T HAVE TO FIRE A SHOT! So the gun really can be a weapon of peace.