NRA convention in Nashville featured seminars telling attendees they must be ready for combat at any time and to emotionally prepare themselves for the death screams of those they kill.

Kyle E. Lamb.

This is a portion of a much longer article from Alternet:

In a large room, one of the hyper-masculine avatars from the showcase posters has come to life and is leading a seminar called, "Survival Mindset: Are You Prepared?" 

Sergeant Major Kyle E. Lamb, burly, bearded, and sporting a buzz cut, tells the -- let's face it, mostly past-middle-aged audience -- that they must stay vigilant at all times. That is because whether they're involved in a shooting in, "Nashville, Detroit, or Mogadishu, it's all combat," he says. Additionally, "You could be the target of terrorists." 

Lamb is founder and President of Viking Tactics, supplier of a "large selection of high-quality, battle-proven tactical gear, designed by warriors for warriors," according to their site. Lamb’s bio claims he is also "highly sought out" as a military and law enforcement trainer. Back in the seminar, he says that the dangers presented by modern life such as terrorism, carjacking and home invasions, demand that warriors always be prepared. 

"How do you prepare?" Lamb asks the audience. Not with "orange mocha Frappuccinos," that's for sure, he smirks, getting loud laughs. Also, their gun must be of a kind that they can access at all times. "If you've got a gun that's too heavy, push it around in a cart if it's that big!" he jokes. 

 The vigilant warrior with a conceal carry permit must have no illusions about what their gun is really for. "Are you carrying a gun for deterrence? Avoidance? No. This is threat elimination. It's part of the combat mindset. You have to be ready to eliminate the threat." 

Becoming inured to the final screams of the dying is another unpleasant, but necessary, aspect of total preparedness. Lamb tells the audience of shooting a bear and being freaked out by the "death squall" ringing through the mountain and realizing that he did not want to show that kind of emotional vulnerability when confronted with a human foe, he says. 

"Warrior skills are perishable!" his power point warns, "If you don't work on them you lose them!"

Well he seems nice. 

Personally I don't think that it's a good idea to become "inured to the final screams of the dying" unless you are a soldier on the front line or working in the ER.

And how would one accomplish that feat anyway?

Fatally injuring creatures and listening to them die until it doesn't bother you anymore?

I'm pretty sure that's how psychopaths are created.