Final answer:
The Nazis introduced methods such as gas vans and gas chambers that allowed soldiers to kill in a more detached manner, as a way to mitigate the psychological toll of mass executions. However, they did not provide substantial counseling or support for soldiers' psychological trauma.
Step-by-step explanation:
The Nazis introduced methods to protect soldiers from psychological trauma while carrying out mass killings during World War II. To prevent psychological damage to the members of Einsatzgruppen, mobile killing units, the Nazis implemented strategies such as using gas vans, which re-routed truck exhaust into a sealed area to asphyxiate victims with carbon monoxide. This method was deemed less psychologically taxing than shooting. Subsequently, the establishment of extermination camps with gas chambers provided a more removed means of mass murder, further mitigating the direct psychological effects on the perpetrators.
However, it’s important to note that there is no evidence of any substantial counseling programs or similar support systems being initiated for affected Nazi soldiers to deal with their actions or the resulting psychological impact. Instead, the Nazi regime's approach was primarily focused on creating more efficient and detached methods of killing to reduce the mental strain on their soldiers.