As part of the EU scheme I think the intention was for local compensation schemes to pay out to consumers and reclaim from the bank's home countries if the bank failed. Obviously this part didn't happen (and possibly could never have happened) but if the FSCS did not list Icesave I would not have invested.
My due diligence was checking the bank was properly covered by the UK scheme and that I did not have more money in it than was covered by the UK's compensation scheme.
A case can be made that those investing more than the scheme should have lost money (not necessarily just for Icelandic banks but also for the UK banks that were bailed out) or that FSCS should not have committed to compensate but they did so they really did need to pay out.