I'm a bit skeptical about Tails and other comsec tools which are a full OS instead of small, separate app. I don't have the time or knowledge to inspect full OS image in detail, and it feels like "secure communications, protected from the guys you don't like" is exactly the thing the "guys you don't like", like government, would create, with proper backdoors in place. After all, that had happened numerously before. (Crypto AG, that story about CIA gaining control of some "secure messaging" devices, etc)