JJ - I understand how you feel and can relate. Fortunately I usually avoided JCs like the plague and only got sucked into a few. Even if the person only got reproof, I often had trouble sleeping realizing the pain the person was going through. When I finally woke up, I realized that the whole process was terribly wrong and that knot in my stomach was my conscious telling me that what I was involved with just wasn't right.
The problem is that most elders as simply as brain washed (even more so) as the rest of the JWs. So, they believe that they are doing God's will. So while some may feel bad afterward, they rationalize it by saying they are only doing what God wants them to do.
sd-7 - I hear you man. I often beat myself up for getting duped into believing in the WTS. The past is the past. We can only impact what we chose to do with the rest of our lives. Sure, I feel awful for participating in the cult's activities to the degree I did. The meeting parts, studying with others (thankfully I never got a student to baptism), the shepherding visits, the elder's meetings where we judged and dissected members of the congregation like we were sales managers, all that stuff. But, what's done is done. I take responsiblity for what I was involved with and yes it is a cult and yes, I was raised that way so I thought I was doing the right thing. All I know is that now, even though I'm still stuck in for family, I will never again influence one other person to tow the WT line.
So don't get too down about whatever level you participated in the past. Just make sure that you don't support the cult going forward. That's all you can really do.