I'm not inside their minds, so I can't tell you what they're thinking, but I'm really glad you brought that up, because I think some of the voices that are saying we are not ready have contributed nothing to becoming ready.
I would submit that one way of assessing whether somebody is sincere about concerns about readiness—as opposed to, as Dr. Grant said, using that as a way to express opposition—is to see what they have contributed towards becoming ready. Somebody who is sincerely concerned about readiness is going to get involved. Those voices have not been involved even when opportunities have clearly been presented to them.