It's not a question of "could". The Iceland banking crash was orders of magnitude worse than Ireland. So far as ordinary people were concerned the entire financial system just shut down without any warning. No access to cash, no credit card transactions, nobody would take payment by check, nothing.
I don't have much sympathy with foreign "investors" who deposited money in Icelandic banks at rates that were way too good to be true. But for whatever reason the UK government decided to support sorting out the mess, so I think they have a right to expect the Iceland government to stick to whatever was agreed at the time.
In some parts of the UK there are still plenty of bad memories of the Cod War over Icelandic fishing rights in the 1970s. I expect the politicians have conveniently short memories about that, but if you looked in the right place, you could find people whose reaction to the original crash was "great news, if they all freeze and starve to death then good riddance, and we'll have party to celebrate."