J'onn, Wally, and Kyle were on the side of keeping him on the team. Diana, Eel, and Arthur wanted him gone.
J'Onn only wanted to keep Batman because he said it would be hypocritical to vote him out, as J'Onn had kept similar files on the Justice League when it first formed. (In JL: YEAR ONE, also written by Waid.)
Wally and Kyle had similar "Who am I to argue with Batman?" reasons to keep him in.