Having a reasonable level of attribution of cyber attacks cant ever be realistic if your opponent isnt a moron, as the indications you work with can be artificially created to fool you.
You likely aren't aware (because you're speaking from ignorance) but you just called literally every intel agency "a moron" here. Even the NSA TAO has been attributed, beyond any doubt whatsoever, multiple times.
Given that you're digging your heels in and seem to be more interested in making false assertions than learning, I see no need to continue this. You've never worked in attribution or threat intel. Why do you feel the need to have a strong opinion about it? Do you do the same thing for other complex topics that you know little about? It's not a good look.