You can't easily, and some obvious incentives muddle the issue further. The Chinese government, in the hypothetical case where they are behind it, has the incen

You can't easily, and some obvious incentives muddle the issue further. The Chinese government, in the hypothetical case where they are behind it, has the incentive to disguise them as criminal-driven. The US DoD and some other agencies, in the opposite case, have the incentive to pretend that the Chinese gov is behind the attacks so that they may bring defense against such attacks among their tasks, which entails budget, manpower, prestige etc.