I've just cleared a backlog of my belated replies. The reasons for not replying immediately:

• It was possible that a proper reply would require extra effort, and it's wasn't obvious how to justify not replying at length (uncertainty about the right way of replying, costly wrong decision).
• It isn't clear to me that I'm arguing in good faith, and hence should continue to do so, but it isn't clear that I don't, so I can't justify not arguing either (uncertainty about the right way of replying again).
• A proper reply would take a lot of effort (even now I've taken a short cut).