How they rationalize it? Simple:
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They blindly trust anyone with the Doctor title. Anyone who dares be skeptical is a tinfoil hat wearing anti-vaxxer.
As I said earlier in the thread Pfizer killed a bunch of kids with some experimnetal antibiotic, the whole affair was shady as fuck. But I'm sure they've changed their ways and go the extra step to ensure your safety.
And again, I'm not saying they chip you (lol), or intentionally poison you. They just care about money, and only money.