Theoddbird We cannot protect all the people all the time. If everyone who was perceived as vulnerable to anything was immediately protected from it, we would all be left living a life of total ignorance , which would feed all the conspiracies we would then make up under the cloud.
I would suggest however,that the people most likely to believe these conspiracies are not the vulnerable but the deliberately ignorant who find pursuing ludicrous conspiracy theories makes them feel special because it scares other people.