I read WC Stevenson's 1975: Year of Doom? and WC Schnell's notorious 30 Years a Watchtower Slave before the term "apostate material" was ever bandied about - let alone put on the "forbidden list" by the WTS. Back then, I believed that as we definitely had "The Truth", then there was no harm done. After all, "The Truth" would stand up to anything, wouldn't it! (Particularly when stood up against the rather incoherent rantings of some disgruntled ex-member; which is how Schnell's work came across as).
Also, during my early years as a JW, the congregation's territory that I was in contained a large component of what are now known as "Alternative Lifestylers". This led to some very interesting conversations while engaged in the "Field Circus".
There were Hippies, Communists, Maoists, Stalinists, Trotskyites, Marxists, Red-Feds, Anarchists, "Born Agains" of various stripes (particularly of the more extreme variety), Draft Dodgers (perhaps even a few army deserters - the Vietnam war was still not over), Pacifists, Spiritualists, converts to the "Eastern Religions" (including Buddhists, Hindus and Muslims):
- all working as seasonal workers for the local fruitgrowers and tobacco farmers; with most of those being either staunchly Episcopalian or of one or other of the Brethren churches.
As far as I could see at the time, yet another person with some unconventional ideas (in this case, a former JW) couldn't be too harmful.
However, once my doubts began to grow, I did some serious but discreet research of my own - even though by that point it had become a definite "No-No"