Suppose you can use your critical thinking skills to convince 1 member of an anti-vaxxer group to consult experts and discover they don't know what they're talk

Suppose you can use your critical thinking skills to convince 1 member of an anti-vaxxer group to consult experts and discover they don't know what they're talking about. If the group consists of two members, then you just decreased its size by half. Great job! Now suppose a influence campaign sponsored by a nation state helps an anti-vaccination group grow from 2 members to 20 members. Now your critical thinking skills only decrease the group's size by 5%. Your impact is an order of magnitude smaller without your skills having decreased. So I don't think this is a matter of "critical thinking."