Okay he has been unbanned twice now. You are talking about the second account of his "unbanning." I doubt anyone will come forward about his first "unbanning" because; A, someone doesn't want to admit they fucked up, or; B, they didn't fuck up and they thought this situation would go unnoticed.
I honestly don't know why DasCJ would change his mind about a ban involving Mass-RDM, especially when the culprit's best answer to, "why did you do it" was something along the lines of, "I just wanted to have some fun." You don't forget something like that easily.
If he is to be unbanned I simply request that he be watched for the first few days and any infractions result in more serve punishments.