I became a witness in 1973, just as I was graduating from college. I was fighting depression and a mental breakdown, and the talk of the world ending fit my view of current events (Nixon/watergate, the war in Vietnam ending badly, cold war etc). I was sucked in by a friend who had a JW mother. A year later I got married to a young woman who had been pulled in by family members.
We both started slacking off by the late seventies, but neither of us knew about the other's doubts. We moved across the state in 1983 after I spent a year in school and found a better job (against the elders' advice). We gradually stopped almost all meeting attendance and field service, stopped everything in 1988 and DA'd in early 1989.
Am I an idiot? I certainly was in 1973, yet I managed to pull my head together and get out before much of the information now available existed. Looking back, I have to say that the JW's did a VERY good job of love-bombing and hiding the dark side of their religion. By the time I understood how JC's and disfellowshipping worked, I was too far in to see my way out. I'm disinclined to disparage those that fall for it.