While I don't fall into this category, I did at one time and so I can understand the position a little. A couple of points:
1 - I saw no reason (and still don't) to be honest with the WTS given how dishonest that organization has been with me.
2 - Unless the person gave away a ton of personal information, the likelihood of being outed is very low. I highly doubt the elders/ms that post are telling their families about that activity. Plausible deniability is the key for any stuck in JW.
3 - Many elders avoid JCs. I know when I started having doubts (pre this site) I made sure that I wasn't on any JCs. Easy to do.
4 - It may be hypocritical if the person involved is enforcing the WTS's rules. Ultimately, it bothered me that others in the congregation were hearing me give talks and comments that I simply didn't believe. I couldn't care less what I told the WTS management (other elders, COs, etc).
5 - The inside information posts drive the WTS batty!! Doesn't that have value alone? How many meetings in Bethel have they had about stopping leaks? I'll bet those leaks chew up time on a regular basis. Just knowing that someone is getting upset about their precious info being leaked makes my day. Also, those with family in but who are being shunned will be able to understand the changes and look for opportunities to perhaps reconnect. Just because it doesn't have value to you doesn't necessarily make it valueless.
6 - It's not easy to just resign without raising huge questions. It takes time to lay the ground work if you want to just fade into the background. Even when you resign, sometimes the BOE won't accept your resignation (look at OTWO's experience).
7 - It's not even middle management for the WT, it's low management. Honestly, the WTS looks at their elders with distain.
8 - As for the original question, my guess would be that they 1) no longer fear the big A and 2) likely have serious doubts about any resurrection.
I can tell you this much, I'm not sure if there is a God but I am sure that no one will be judged based on their response to the WT. If we indeed answer to a higher power, it will be on the basis of how we treat others and whether we lived a good life. It will not be because of any stupid religion (in my opinion).