I once asked a wise professor of mine what the best thing about being a professor was. He replied, "The fact that I can go into the office of the department chair, tell him he’s an #*$!%! and there’s not a damn thing he can do about it." Shocked, I said, "but you’re a level headed, nice guy, you would never want to do that." He replied "yeah, I never would, but the thought that I could if wanted to is worth a huge amount."
The lesson? Liberty is not always an instrumental value subordinate to positive capabilities.