Those two things aren’t necessarily tied together. There’s a difference between, “I’m pretty sure my conclusion is right, but I don’t know enough technical detail to argue for it very convincingly to someone who knows a lot about the field and has prepared rebuttals,” and “I suspect deep down that the view I’m advocating is wrong, but I need to hold onto it for personal reasons, so I’ll submit such weak arguments as I think might pass muster among the non-critical, and back out silently if someone walks into the room who can demolish the arguments.”
For example, over at BioLogos, Darrel Falk, Kathryn Applegate, and Karl Giberson regularly ignored critiques of their published words, both on scientific and theological matters, and while I would agree that in many cases the reason was that that they did not think they knew enough (about theology, about current evolutionary theory, etc.) to defend their positions, and therefore deemed silence a wiser strategy than engagement, I think they sincerely believed that their positions were not badly wrong, but in fact right. I think they thought that theology and/or biology supported their claims, but were aware of their own inadequacy to defend those claims.
One of Falk’s tactics, when he was incapable of carrying on an argument against a trained opponent, was to try to bring in a “heavy hitter” to carry the burden of argument for him. Thus, he would bring in Ayala to attack Meyer’s book on the origin of life, apparently because he (Falk) did not know enough about origin-of-life theory to respond in a serious way to Meyer’s arguments. (Of course Ayala’s own field was nowhere near origin of life, and he didn’t engage any of Meyer’s specific arguments, and there is some doubt over whether he ever read Meyer’s book, but that did not matter to Falk; the important thing was that Ayala was a “big name” in biology, and Falk could stand behind him, the way an unarmed civilian might stand behind Captain America, protected by his shield.) Falk also brought in Francis Beckwith at one point, to make theological criticisms of ID. Such tactics are consistent with Falk believing that his position (ID is bad science and bad theology) was right, but knowing that his ability to defend that position was lacking.
I suspect that the OEC people sincerely believe that they are right (that the earth and universe are old, that God created basic “kinds”, and that God specially created man) but are not prepared to rigorously define their terms (kinds, species, etc.) because they aren’t ready to defend their position based on such firm definitions. And there really isn’t any excuse for this procrastination. It’s not as if OEC was just invented yesterday, and they need time to think things out. OEC has been around for a hundred years or more; refusal of OECs to engage publicly, signing their individual names on the subject of what constitutes a created “kind” and how much “microevolution” could have occurred, is a sign of serious intellectual weakness in their position. Even if they don’t agree among themselves, nothing stops them from answering challenges as individuals. It’s to the discredit of the whole group, from Ross on down, that they won’t respond to challenges.
YECs, on the other hand, are not afraid to jump in and defend their statements. Taken as a position, I find YEC to be inferior to OEC, but in terms of sociological/political behavior, the YECs are in a much stronger position than the OECs. When most people think of “creationism” they think of YEC, and the reason for this is that YEC is a much clearer and more focused position and that YECs are not wafflers or evaders, but have the courage of their convictions.
(Caveat: Not all OECs are affiliated with Ross’s group, and there may be OECs who are willing to be very specific about created kinds and how much “microevolution” they allow. But we here have been talking about Ross’s group, which is the most prominent group and the public face of OEC in current origins debates. So if it turns out that some OECs are not guilty of the behavior I’m here criticizing, I apologize to those OECs, but Ross’s groups deserves to be on the hot seat here.)