Wow Steve, that description was bang on in my opinion. I've always struggled with the idea that they shun out of love. I suspect that piety and self-righteousness is the more accurate reason. The only thing I would add is that they attach the label of "love" to their conduct because then they have justification for behaving like fanatical pompous asses.
wtphobic (great screenname btw!) congrats on your upcoming wedding. It must be hard on your fiance knowing he never wants to go back, yet still believing that they are somewhat right. Makes me wonder if deep down he feels a little of their behavior toward him is justified. I think you are doing the right thing by continuing to treat your future in-laws with kindness and civility, but also not allowing their behavior to be swept under the rug. The more exposure to normal thought processes your guy has through you and your family, the better off you will both be.
I agree with other posters who suggest to get him reading about this stuff, here, on other sites, but to that I would add one more. Is there any way you guys could make it to a meet-up or something in your area? Just socializing in person with folks who have "been there" is really freeing. The control becomes so much more clear, plus, who else can an exiting JW sit around and really talk about the loony JW doctrine with? It might make a world of difference.
O