jurs, I don't know what kind of message is being sent by DA'ing. I remember the first time I heard a DA announcement. The thoughts that went through my mind at the time was simply that the person was weak. That they couldn't follow the rigors of being a faithful follower. At the time, I never got the feeling that there might be something they had a legitimate problem with. All I remember them doing was announcing so-and-so had dissassociated themselves. No whys, no reading the person's letter. Just that they had done it. It was far from being a strong message to others. Although for closure, if that's what somebody needs, then it is a help to them and that's a personal choice.
I've never really understood writing a letter. Once you make it official, you're placed in the same category as a disfellowshipped person. If you haven't got friends or family inside, that's probably not a big deal. I have family inside and I'm glad I never did it. My family is still important to me, though some of them are strong JWs. Though there is sometimes a sense of looking down on me and maybe a little aprehension, there is not outright shunning.
At times, I thought of writing a DA letter after my parents pass away. But now, I'm not going to bother.
As has been said, they are seeking closure too. Why give it to them? As for your closure, that might be remedied by groups such as this. To see that others are out there and are willing to befriend you online in this forum. That you can share your past. That you can see that others have put it behind them and you can too.
Closure is mostly mental. If you can acheive that without the ramifications to family relations, why not? Just fade away and leave it at that. Don't challenge the JWs and let them know what you really think. Just change the subject when it comes up.
-j.w.s.