...and decided to deactivate the chips.
He couldn't stand the sight of his brothers and sisters demise and chose his own way out. 

BTW, there are female feral ghouls in FO3? Most of the time they are males.
there are no female feral ghouls. I believe that all ghouls lose all their sexual characteristics once they go feral. Thats' why all feral ghouls look the same