Most corporate networks are going to inspect or block HTTPS traffic too. They have security and regulatory compliance concerns, and consequently deploying tools capable of intercepting that traffic is pretty much the norm these days. It's all but certain that if you have a work PC then your contract/handbook/etc. states that this may happen, unless you're in an area where the legal basis for this sort of inspection is weaker.

Protecting people who aren't at work but are using a potentially hostile network (public WiFi, etc.) from their own device is certainly a legitimate concern.