“If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind.”
Or that it is a slippery slope to that condition?
As many people have pointed out, it's actually vanishingly rare for people to get punished for unpopular opinions. In general you only get there if you are sincerely promoting genocide (e.g., Spencer), suggesting that not all humans are fit for freedom. (e.g., Moldbug), or that existing cohorts of people who very clearly were offered fair standards of grading are inferior (as Damore did even though he can't seem to come to terms with the real implications of what he wrote).
And these are "opinions" many people have and never get any sort of actual punishment or damage to themselves so long as they don't bring it into professional or policy environments where we have agreed it leads to discriminatory practices.
It's interesting how the rhetoric about "liberal feels" is so strong online when it's only said "feels" that make most people feel oppressed anyways.
"If the opinion is right, they [the human race] are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error."