It's a very small religion that does not have a publishing arm. That the Watchtower publishes more, and often better written, material than many others would not dissuade a committed adherent. Uncle B, the surviving author of the Separate Identity series, pointed me to the concept of Triumphalism. We were discussing the lack of rational refutation in the Russell era. But the thought applies to Watchtower belief as well. Douglas Hall, in The Cross in Our Context: Jesus and the Suffering World (2003), wrote:
"The tendency in all strongly held world views, whether religious or secular, to present themselves as full and complete accounts of reality, leaving little if any room for debate or difference of opinion and expecting of their adherents unflinching belief and loyalty. Such a tendency is triumphalistic in the sense that it triumphs - at least in its own self-estimate - over all ignorance, uncertainty, doubt, and incompleteness, as well, of course, as every other point of view." - page 15.
This is the issue with Witness adherents as well as their conservative Protestant opponents. If you see your belief system as fixed and inerrant, you will avoid debate as unnecessary. You will pity those on the outside. But you will not question your faith.