I don’t really have a good answer for you, but I mean you yourself used the word “resistant” to exploits, not impervious. Nothing is bulletproof, so if a user has any concern, rational or not, what’s the harm in covering it?

Maybe your question really doesn’t have to do with the webcam question, it’s more about the level of trust you should or should not have in your software. And that, to me, depends largely on the individual.