I am always highly suspicious whenever a large scale cyber incident occurs, primarily because the manner in which these events are explained to the public does not begin to cover certain important realities. For example, the mainstream media rarely if ever discusses the fact that many digital systems are deliberately designed to be vulnerable.
Software and internet corporate monoliths have long been cooperating with the NSA through programs like PRISM to provide government agencies backdoor access to computer systems worldwide. Edward Snowden vindicated numerous "conspiracy theorists" in 2013 with his comprehensive data dumps, exposing collusion between corporations and the NSA including Microsoft, Skype, Apple, Google, Facebook and Yahoo. And make no mistake, nothing has changed since then.