I think these are the same thing though. You want to ensure that you have a hardware way of turning your camera off _because_ you know that ultimately you have no control of the software that runs on your laptop. If you had good software assurances you wouldn't need hardware switches. That's the same idea as 'being hacked' (malware, targeted or otherwise) or the threat thereof: that you wouldn't be in control.

To me, its just least-privilege applied. The camera needs to be used when _I_ want it. That's it. The OS doesn't get to decide, malware doesn't get to decide, they don't need access to activate it.