Pre Microsoft Skype was malware-grade good. I still remember sysadmins imploding in impotent rage as it near effortlessly evaded their firewalling attempts.
In your car you have an expectation of privacy. Public transport is by definition a public space and thus has no expectation of privacy. Whole different ruleset applies. Anyone can monitor you on a bus. Without your consent too.
Nah, power forces you to operate in a different paradigm as does absolute power to an absolute degree. It's a known psychological factor, called "professional deformation" or even "occupational psychosis".