I used to believe this. But I feel more and more we need to promote a culture of free speech that goes beyond the literal first amendment. We have to tolerate weird and dangerous ideas.
Refuting does not work... You can throw scientific study upon study, doctor upon doctor, ... negatives run deeper then positives.
In the open, it becomes normalized, it draws in more people. Do you rather have some crazies in the corner, or 50% of a population that believes something false, as it became normalized.
The only people benefiting from those dark concepts are those with financial gains. They make money from it, and push the negatives to sell their products and cures. Those that fight against it, do not gain from it and it cost them time/money. That is why is a losing battle.