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Re:A US-born NASA scientist was detained at the border until... by EGreg on Sunday February 12, 2017 @02:30PM (#13630089)
Deniability.

Have many accounts, some of which have a subsetof your email which is totally safe. They can even be mirrors.

Or alternatively, have all your sensitive communication on other channels which leave no trace (in browser history, for instance).

Simple!

PS: It would be cool if apps let you have steganography... like Facebook Messenger or WhatsApp wouldn't show ALL conversations until you entered a specific password. They could even have groups of hidden conversations. Even if cops know that, they will never be sure if you revealed everything. This may be good or bad for you.

Re:A US-born NASA scientist was detained at the border until... by usefulcat on Sunday February 12, 2017 @03:31PM (#13630549)
That presupposes that you can accurately determine exactly what qualifies as "safe" in advance.
Re:A US-born NASA scientist was detained at the border until... by EGreg on Sunday February 12, 2017 @04:02PM (#13630783)
Better than nothing - which is what these apps offer now in terms of incognito sessions.