Well, he has made a lot of them but this one is a teaching moment to keep in mind for a time when things get real totalitarian.
Bill Palmer explains:
When the news broke yesterday that Robert Mueller had caught Paul Manafort using encrypted communications like WhatsApp to try to tamper with the witnesses against him, I was in the midst of a conversation about a different matter with an expert on internet security. I told him that Manafort’s WhatsApp communications had been seized. He told me that shouldn’t be technologically possible. Then I told him that Manafort had backed up his WhatsApp conversations to the cloud. His response: “What an idiot!”-RW
It just got worse:
Mueller's Team is Requesting Witnesses Turn in Their Personal Phones