Why are you so upset about this? The poison could be graphene hydroxid, could be the spike proteins, could be one thing in one batch and one other thing in another batch of vaccines. They can run multiple experiments/missions in parallel.

I don't understand why would you think it's hard to do something like this. Johnson and Johnson knowingly had asbestos in their baby powder for years. This is literally everyday business at pharma companies, big agricultural and food companies. You put something out to make a profit, cover up side effects, bribe regulators, ignore contamination issues because it's cheaper just to pay some lawyer and PR people than get rid of the real problem.

Modern world manufacturing processes are perfect for these kind of things, where you can neatly separate processes between companies and countries. Have some ingredient manufactured in place X, move to country Y repackage it, move to company Z mix it with something else etc. Nobody at any of the sites needs to know the end goal.