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Why don't they understand the pathway for the side effect and figure out a diagnostic test for it so people who're hesitant/worried (or everyone does it to protect everyone from the side effect) so they can be screened out from getting the vaccine then?

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Why don't they just solve world peace and faster-than-light travel?

Because these things are hard. Lacking the ultimate solution, a small step is better than nothing.

Or do you only walk because cars and trains are too slow to get you to the next solar system so why bother ...?

I'll disagree on the behalf of people who are harmed.

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