Which does not matter. Their tiny amount of research does not matter compared to the actual research, and billions of examples of evidence. Vaccines save more lives than anything else.
It is easier for those with a clear understanding of the world around them. Conspiracy theories are mostly propaganda. People are easily controlled by conspiracy theories.
Not in the targeted disruptive sense. Conspiracy theories tend to come from sources looking to disrupt the government, or whatever authority. Other nations. Religious groups.