This seems incredibly naive. The present proliferation of anti-vaccine sentiment is almost entirely the result of propaganda pushed by a tiny number of people being amplified by social media. You can argue about whether or not it's right to suppress information on principle, but I don't see how you can argue it's ineffective. It's ineffective at combating actual truth when things like the Supreme Soviet just lie about meeting their five year plan goals and imprison anyone who presents real data, but scientific journals and newspapers introducing some editorial curation in what they were willing to amplify worked perfectly fine at actually suppressing fringe pseudoscience and false conspiracy theories for centuries.

I get it. Some conspiracies turn out to be true. Watergate happened. The Panama Papers happened. COINTELPRO happened. The FBI probably really did assassinate Fred Hampton. Galileo was right. But for every Galileo, there are a few thousand cranks thinking they disproved special relativity or invented a perpetual motion machine and refusing to grant them a platform has worked fine forever until social media came along and gave everyone an audience.