She has been intoctrinated with thought stopping techniques. She has been trained to use cliche's and catch phrases like "at least they are honest about their mistakes" or "where else can we go" or "they are just imperfect men" or "apostates just want to tear down, they never want to build up".
These are just a few examples. By using these cliche's she is able to answer the question in her mind without any further thought or analysis. Anyone trying to get her to view the jw in a negative way is trying to take her faith away! Anyone trying to take her faith away is trying to endanger her hope for eternal life.
Why would she want to listen to that?
You do not have a jw problem, you have a cult problem. Spend more time learning about cults and how to help people in them. Spend less time hassling your wife over her beliefs. It won't work and it will only cause her to view you negatively and with less trust.
Combatting Cult Mind Control by Steven Hassan is probably the best explanation of this phenomenon. His next book, Releasing the Bonds is excellent as well.
For info on cults check out rickross.org. He has some good videos if you aren't much for reading.
Take care. There is probably nothing more maddening than being married to a JW. But there is hope, and there are many here who share the experience.
Don't try to re-invent the wheel. There are many who have been where you are. We know what works and what doesn't.
CYP