Yes, the do exist.
Not all wounds bleed. At least not visibly. One vet in 5 comes home with a traumatic, concussive brain injury, according to a recent report. Readjustment to ordinary life is a life-threatening experience, according to many therapists.
But BillO', himself a chickenshit chickenhawk, would surely say those damaged souls were just 'weak.'
I really, truly, honestly hope a gang of homeless vets catches O'Reilly in a dark alley, and beats him senseless, mebbe with a prosthesis; just beats the fucker til he whimpers, soils his pants and crawls away whining in shame and humiliation.