I feel like a high value target to me, though. If the environment is untrustworthy enough for Zuckerberg to defend himself against it, he should consider his own role in making it that way.
But the truth is you should always treat your environment as untrustworthy. I don't think you should deduct him points for blocking his webcam.
It is an ADDITIONAL privacy step. He runs a company with thousands of employees, and with any company like that you never know if someone may decide to become a bad actor, and physically compromise him.
Yes, because they're voracious collectors people's personal information. We can hate on "bad actors" as well, we don't have to choose one or the other. But as long as Facebook is behaving creepily, whether deliberately or inadvertently, let's hate on them. There is no reason to tolerate their mistakes.