The issues may be far more complicated.
"They want everything in black and white."
I believe this applies to every religion. Adepts want to see things in simple, uncomplicated terms, and the simpler the better. If the earth was created in six days, six days be it. Anything beyond that fundamental interpretation is bound to raise contention, spurn depths that religion in the basic sense is not kitted out to handle. It is not typical of Jehovah's Witnesses.
"They prefer to leave thinking to others."
Again typical to most religious groups. That's why there is a clergy class in every structured religion. The clergy are supposedly closer to the divine, therefore able to think and interprete, teach the laity.
"They are scared to be shunned."
Rightfully so. It's human to want to belong to the group and not be ostracized. It's sad for any religion to use "shunning" as a weapon. This is one of the most reprehensible of practices among Witnesses. Unfortunately, the majority of witnesses think they are right and biblically authorized to disfellowship and shun - even as the Catholic Church claims every right to excommunicate.
"They are just ignorant souls who are on the "opium of the people" "
You could generalize that to every religion and body of beliefs. Which would make every believer in or practicer of a religion an ignorant soul, needing a frequent fix of that "opium"....
"They dont want others to think bad of them."
An all too human reaction.
Could it be that many Witnesses who choose to remain simply want a religion to cling to, and they are reasonably comfortable with what they have?
I think it too presumptuous on anyone's part to dump scores of thousands into simplified and simplistic pigeon holes for their own comfort.
PC