There are segements of the media who are trying to take "compassion fatigue" (a real malaise, I've seen and tasted it myself) and turn it into "pre-PTSD" or "PTSD-by-proxy" given Major Hasan's counseling of soldiers plagued with PTSD.

Okay.  We take the measure of a person by how they respond to adversity.

Major Hasan responded by murdering people who thought they had every reason to trust him, and certainly no reason to fear him. 

Brave, brave Sir Robin!

Meet Captain Karla Clarke.  She has served continuously in the Landstuhl ICU since 2005, with the exception of the year she spent at 'Baghdad ER'. When she leaves there next month, she is going to.... the Burn Unit at BAMC.
 

Army Capt. Karla Clarke, center, an ICU nurse at Landstuhl Regional Medical Center, assists in transporting her patient to a bus for air transport in August 2007. LRMC has become the only hospital outside the U.S. designated as a Level II trauma center. Photo: Ben Bloker, Stars & Stripes.

Take the measure of this soldier, as related by MaryAnn of Soldier's Angels Germany:

These are just 2 of Karla's hundreds and hundreds of patients.

She would not leave this soldier until MaryAnn promised to stay with the family.

I rather suspect her good days were better than Major Hasan's worst.

Yet, there are no indicators that she's going to be picking up a pistol anytime soon.

Except, perhaps, to defend her patients against a Major Hasan.