I would say the majority of JWs are born-ins these days, I would say several generations down by now from the original converts - in western countries anyway. So this "the borg attracts crazy people" defense doesn't cut it anymore.
My personal opinion is codependency and narcissism are rife amongst JWs. WT is the ultimate narcisisstic gaslighter and JWs are the codependents. And because what goes around comes around in JW families you have narcisisstic parent usually the father but sometimes both while the mother and kids are codependent. Individual JWs are both codependent and what I call religiously narcisisstic. That's my theory anyway.