Again, where’s the “shooting civilians in the back” part? You don’t suppose that Rustabout is...exaggerating? Again?
Probably some were shot, not documented so historically not accurate. If I were to guess, I would say it's true, just due to the scope of the heinous operation.
The whole thing was sick and demented enough without first hand accounts of civilian casualties. "Well, we didn't shoot anybody" is hardly a justification.