That may be one reason, but it has been widely reported that the military has long been working to decrease hesitation to kill another human using more lifelike

That may be one reason, but it has been widely reported that the military has long been working to decrease hesitation to kill another human using more lifelike targets, video games, etc "The Pentagon improved firing rates. Research suggests that 55 percent of U.S. soldiers fired on the enemy in the Korean War. By Vietnam that rate had climbed to more than 90 percent. Police studies document similar changes in recent decades. One of the key changes was to get rid of the old firing ranges, where shooters took target practice in an open field aiming at a bull's-eye. This failed miserably at preparing shooters for real-world confrontations." https://www.google.com/amp/s/www.sfgate.com/science/amp/THE-SCIENCE-OF-CREATING-KILLERS-Human-2514123.php https://www.google.com/amp/s/www.sfgate.com/science/amp/THE-...