Like other people, he has become a victim of conspiracy theorists. We had a thread headed by someone else in your position - except it was a sister, or a relation like that.
I suspect that the only thing you can do, is just refuse to discuss the subject with him other than tell hin, you will decide for yourself when the opportunity for a vaccine presents itself.
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and to also think that governments around the world want to tank their individual economies, defies logic!