Just look at the past 20 years and the success of the gay rights movement. Views changed because of millions of one-on-one conversations between people who disagreed on gay marriage. No censorship was required for progress. In fact, censorship would have been counterproductive, as I believe it is here.
It's no coincidence that the countries with the least free speech also tend to be the most regressive on civil rights and some of the worst places to be an ethnic minority.