[hammock]

>is it safe enough to have it taken by everyone in the world ??

Alternative: if we don't know it's safe, better have everyone take it, or at least as many as possible. That way there's no reliable control group to compare outcomes, and no one can blame the vaccine, and it's easier to blame other external factors or say we don't know.

This is (systemically) the general approach taken with many environmental toxins. It's only when unfortunate, acute "cancer clusters" etc appear that some really nasty chemicals which are prevalent everywhere - like PFAS, etc - come to attention.