quite a valid point!
just like you can NEVER trust a windows (or mac or even linux box) that was not setup by you, especially if its a corporate box that was given to you pre-installed.
almost every company of mid-size or larger preinstalled MitM certs for their spying firewalls. they don't tell employees that, but netadmins and sysadmins pretty much all know this.
I work at a large networking company and they didn't tell me WHAT they do or HOW they'd spy on me, but I found out via a friend (in germany) exactly what they are doing. in .de, you have to disclose to the employees a lot more than the US requires you to do, and he relayed the info to me about how our corp laptops come preinstalled with corp spyware. ability to active mic, camera, screen caps, all that bullshit in addition to traffic logging.
I'm a network mgmt guy and when I was out interviewing for jobs (the last few years) almost all of them involved DPI and MitM attacks, even though they tried to explain it away as 'troubleshooting information' and 'for the users benefit'. quite bullshitty but they said it with a straight face, like they believe their own BS.
you guys have to start realizing that corp america is all about privacy invasion; of customers and employees, alike. if you have a corp laptop, do NOT login to your home email systems and keep your work laptops entirely clean of anything personal and home related. yeah, even if you see the lock icon on the browser, it means nothing anymore, in a corp LAN.