Science, it turns out, is an excellent place to find such people. After all, the scientific method requires you to recognize when you’re wrong - to do so happily, in fact. The story of Daniel Bolnick, an evolutionary biologist who had the courage to recognize his mistake.
It's the (Democracy-Poisoning) Golden Age of Free Speech
For most of history, the easiest way to block the spread of an idea was to keep it from being mechanically disseminated. In today’s networked environment, it would seem that censorship ought to be impossible. This should be the golden age of free speech.