It was a rhetorical construction to rebut the question you asked - I am doubtful, not presuming, about the Irish banks ability to cause this. However I'm still pointing out that avenues of investigation shouldn't be dismissed out of hand. The logic of that approach has been disproved time and again. For example, the medical establishment once thought that the idea of a bacterium (H. Pylori) being a major cause of stomach ulcers was "insane" - but it turned out to be true, thereby vastly reducing the profits of people who made stomach medicines.1. It is a reasonable question. Get the evidence for the answer you are presuming, and I will pay it some attention.
Nope, its fairly central, because contracts without penalties for wrongdoing where the potential is vast are themselves prima fascie proof of poor governance. Poor governance was the root of all this, for those who cannot bring themselves to accept it was intentional.2. Separate issue. Reasonable point, but I am not going to be distracted into that discussion now - it is irrelevant to the question of whether crimes were committed.
3. There appears to have been poor contract documentation all over the banks. You have a point there, but not as regards criminality. We own AIB: why are our elected representatives not investigating what you suggest ?
Looking back over the Q & A's Fergus I think out answers are slipping out of sync, but I'll agree with you on this last point.
I'll venture to suggest that to do so might open up a series of vistas that those in power might find embarrassing and leave it at that.