Pulease
“The human brain is not designed to take a life without some form of consequence. There is a reason why the homicide, suicide, divorce and addiction rates among police officers especially, are so high.”
Having never been in the situation I obviously can’t speak definitively but I will disagree anyway.
Our Torah mandates numerous times that we are required to kill. It goes so far as requiring citizens to carry out death sentences. Hashem wouldn’t do that if it was harmful.
I will posit that the difference is mental preparation. A frum yid who has years of halachic training and a deep understanding of the idea that we should hate and thus remove evil from the world, is far better prepared to kill when necessary.
In other words if you see war as a mitzvah it shouldn’t create PTSD.