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.

Whether something is normalized or not is mostly down to public opinion, not to censorship (whether by the government or by private parties).

Few countries have more restrictions on Nazi speech than Germany. And yet not only AfD is a thing, but it keeps growing.