Science, as colloquially understood, seeks to empirically validate truth - true things can cause “harm.” So which is it? Are you looking for censorship of untrue ideas as discovered through open scientific inquiry, or, are you looking to censor ideas which cause harm. You can’t have both.

Put that aside, first principles, how can you hold a robust scientific debate on a topic that’s censored? The historical and common sense evidence strongly indicates it’s not possible.