Because rushed vaccines historically have a history of neurological damage, paralysis, steriliation, and death. The original swine flu vaccine, decades ago, was completely abandoned and memory holed after it fucked up more people than the original virus did. And vaccine companies like the Gates Foundation have decades of history damaging and killing people with their charitable nonFDA approved vaccines.

It's a gamble, to be truthful. First generation of a vaccine? Hell no. Second or third and maybe they'll have a safer variant. So far, the vaccine they're tested in the UK has killed one and put four others in critical condition.