I think it is important to keep in mind that IETF working groups, unlike typical discussion mailing lists, have a given set of tasks to accomplish as a collaborative work. Collaboration requires that those involved be working towards a common goal, even if there is disagreement on how best to get there. Folks who disagree with the goal itself should argue outside the working group, not within.
I see no reason to tolerate harbingers of doom unless they are being constructive. If there is a hole, plug it. If there is a missing feature, describe it. If there is a bug, squash it. Collaboration isn't hard once people agree to be constructive.
....Roy
