It's because there are ghoul cities where everyone is a ghoul. Not to mention many people are being accepting of ghouls now. Think of it like when the war first happened, ghouls were segregated, now with all these ghouls popping around, people begin to become more tolerant. Of course there would still be ghoul haters(like myself, I just use them for an army) but overall, ghouls aren't hated as much.
Also remember that they live for almost 200 years so they learned to deal with it.
I require more information about the use of ghouls in your army. I find it outrageous to arm ghouls, but there are some other ways to use ghouls in an army, like forming ghoul mine-trampling units, or to strap some explosives to them and train/force them to run into hostile tank formations (kinda sick if you know the Soviets actually did this to humans).
You may also be interested in signing up with the Confederate States Army*. We have use German WW2 weapons, and some Lasers based upon them. What we use them for, to shoot ghouls, super mutants, androids and robots. Rewards can include your very own farm or plantation, complete with slaves.
*The Confederacy can not be held accountable for any weapon malfunctions, lack of targets or simply getting shot in the back by the overeager Redneck that was supposed to cover you