Because we'll work to give them reasons to trust us. There isn't any other option unless we simply don't try.
I agree that a certain level of transparency is best. But, there's nothing that says transparency as to mean we hash everything out publicly if no one else is participating. We could formulate a plan as a group and present that plan to the rest for their approval as easily as we could vote in an election with no volunteers.
What we're doing now isn't wholly working, even with Harry in charge. Since Harry's opted to quit, this is an ideal time to reconsider our options.