“think it through logically - an American pharma company comes up with a vaccine. If this was remotely poisonous, then the Chinese or Russians etc. would make hay of this - or the American company’s rivals would use it to make money.”
Your logic is not applicable if the pharmaceutical companies are colluding with foreign agents.
China and Russia have their own vaccines. Far less effective than Pfizer.
They are competitors and would live to show any faults in an American vaccine.
But they found none.
The Pfizer vaccine does not contain graphene oxide