Some were "reached" by the cult at especially vulnerable moments in their lives.
Others were simply taken in by the lies.
The above examples apply to me. I was reached by the WTS while I was still in my teens. My childhood was filled with turbulence and uncertainty. When I attended my first meeting, I was lovebombed and made to feel I was special.
Later on when I became disillusioned and began questioning, I was cast aside like a dirty rag. I do not attend any church now because I've had enough of organized religion. However, were I to begin attending a church and found myself disagreeing with it, I would walk away. Simple as that.