Part of AZ's job is to manage their relationship with their DSMB (which is not the FDA). Even if they've done the science correctly and developed a good vaccine (I happen to think the evidence supports this view) they are also supposed to manage these relationships to stop this kind of disagreement becoming public.
Either one of two things has happened:
1) Their independent DSMB have conspired to screw them for reasons unknown - I think this is pretty unlikely.
2) They have mismanaged the communications with the DSMB and released results which it was their job to know the DSMB did not agree with.
Something not being approved is not the same thing as a ban. You and I might think there is enough evidence, given the context of the pandemic, to have started using this vaccine in the US but I am not qualified to assess that.
Either one of two things has happened:
1) Their independent DSMB have conspired to screw them for reasons unknown - I think this is pretty unlikely.
2) They have mismanaged the communications with the DSMB and released results which it was their job to know the DSMB did not agree with.
Something not being approved is not the same thing as a ban. You and I might think there is enough evidence, given the context of the pandemic, to have started using this vaccine in the US but I am not qualified to assess that.