Look, let us talk in a raw form.

The vaccine, all different vaccines will have an impact that is not visible, will not be visible for quite sometime. They will not be perfect, so to simulate what the mass knows about the vaccines and the side-effects but it will be passed as safe after some months.

All the reactions of the body to the vaccine will appear exactly two years after the D-Day.

People will not have the courage to do anything then, because there will be a feeling of doing the best but losing the battle because the virus was quicker to adapt.

In reality, the mass will never believe even in their most personal moments, that it was done deliberately.