Pretty well all history isn't so much a matter of right and wrong, as of right and wrong and wrong and right.

It's not speculating as such I'm against, and I do a fair amount of that myself - it's when speculation is built on speculation, and people start treating the initial guesswork as fact, and forgetting how speculative it is. That's more or less what the British and Irish authorities have done in this case - and I think it's a good idea for the rest of us to guard against following their lead.