I truly believe for most JW's who are still in and have doubts- it's the old cliché that "ignorance is bliss " - they WANT to keep their heads in the sand like ostriches ignoring the facts about the WT Society's injustices because it's a familiar feeling to them to be in an organization with everybody else feeling duped and disempowered as well.
It's kind of like abuse victims in a bad abusive marriage who refuse to leave- yes, it's bad, it hurts - but abuse is all they've known so they grow accustomed to the abuse- it's familiar to them and they are afraid or fearful to leave because it's all they've ever known. I feel JW's are this way because their minds have been programmed to know nothing else. It's a bad situation but to them it's less fearful than " the unknown " outside the organization. I think that's it in a nutshell. If only they'd take a chance and breathe the fresh air of freedom away from the mind control cult JW's they'd be a lot happier. But once again - they don't even realize that could happen having been pre-programmed in their hardwired WT brains