Wouldn't we want the exact opposite? Slavery was once the norm, talking out against it was how we actually changed it. Trying to imply that we should censor all

Wouldn't we want the exact opposite? Slavery was once the norm, talking out against it was how we actually changed it. Trying to imply that we should censor all those who go against the group is no better than if everyone who was against slavery was killed. It makes no sense in any "free" America where censorship of differing ideas is something we should strive for. When did the public suddenly get too sheltered from reality?