Secure channels inside secure channels
Public infrastructure is never going to be secure. There are too many interests to intercept. Therefore never trust the default "encryption" and use an encrypted tunnel you control. You would not use a telnet session inside an ipsec tunnel. You'd still use ssh. Also, you send pgp email, even though the general smtp links are tls links nowadays.
The examples are all a secure channel inside a supposedly secure channel. The security starts when you are in control.