--That's a question I keep coming back to. It's probably a "Human nature" question more than anything else, but perhaps someone who was a full-fledged JW (Unlike myself) can explain it.
Virtually the entire JW belief system, even their name, revolves around their public ministry and this ministry is based on certain ideas and premises:
1. Witnesses don't come to my (Or your) door because they want us to accept on faith that they are the true religion. Witnesses come to our door because they believe the truth of their religion can be proven from the Bible
2. Witnesses believe that the "Truth" of the Bible is fairly easy to grasp, as it stands in marked contrast to the creeds, superstitions, mystery doctrines and all other "Falsehoods" taught by other religions.
3. Witnesses therefore see their religion as "True worship;" their collective body of beliefs as the "Truth" and all other faiths as "False religion."
4. Witnesses believe that any "Honest hearted" person will accept the "Truth" once it has been adequately explained and it is upon this that the idea that the preaching work is a life and death matter is balanced.
Therefore referring to the JW religion as a "Faith" is almost a misnomer. It is at its core, a "Proof-based," rather than a faith based religion. There are no mysteries in the Witness religion Witnesses actually make fun of mystery doctrines in other faiths. After all, how can you expect a total stranger to accept ideas if you can't prove them yourself?
With the one single, isolated and relatively rare example of the heavenly calling, there are no spiritual experiences in the Witness religion either. Subjective experiences have no place in a courtroom environment.
Given this background, there is really no place for faith based explanations and excuses from an active JW. --Yet we hear them from JW's all the time. For a JW, they're as natural as breathing. For example:
"Have faith in Jehovah's orgainzation." --Sorry. That doesn't cut it. In the JW belief system, people are judged based on their acceptance or rejection of the "Truth," not on their acceptance or rejection of your subjective belief that it is the truth.
"That was a long time ago." --Irrelevant. The premise for the door to door ministry has not changed.
"The light is getting brighter." --Again, that doesn't cut it. A belief system which holds that anyone granting that latitude to his or her own religion will die does not have the luxury of being wrong themselves.
"Wait on Jehovah" --Another invalid excuse. Why come to my door if you're not sure? Come back after you've figured it out and you know what the truth is.
"That was old light." --Tacit admissions that what was previously taught was not true are incompatible with the idea that people would be destroyed for not grasping the "Truth" of your religion
How can a JW say these things? How can a believing JW make excuses that are incompatible with the larger framework of their own religion? (i.e. The premises which the door to door ministry is based on.)
When you were a JW, did you ever feel any contradiction? Did you ever feel that you were holding other people and other religions to a higher standard than your own?