I have read speculation that 50% of attendees are PIMO. I think that percentage is overly optimistic but suspect there is a substantial portion who do not consider themselves as PIMO but recognize things are not as WT claims. Many might feel that God is watching and will punish them if they investigate the religion independent of WT. There are likely others who know WT is wrong about many things, but continue to think, "What if WT has it right overall?".
WT are masters at programming it's members to doubt and second guess their own thoughts and and opinions, instead programming them to rely on WT to tell them what to do and how to think.