I think this only holds if you take a deeply communitarian outlook, which is somewhat difficult to mesh with a belief in the value of the exceptional individual.

I value freedom of speech for the same reason I value other freedoms, for the boringly baseline and everyone else, as well as for instrumental reasons - briefly, freedom is its own good because humans are wired for it; and suppression of speech leads to broken, damaging government.

In any case, small clarification - I do believe that exceptional people in the sense we're discussing exist. But they are far rarer, and the Superhero CEOs we're talking about are not those.