I'm not necessarily disagreeing with the decision, I don't know enough about the clotting data to do so, and I can certainly see the necessity in preserving the public's faith in vaccines.
I'm more saying that the incentives of regulators/politicians aren't always aligned with public health, since the decision that protects public health and the decision that protects careers aren't always the same thing.
Then it's not political reasons, it's simply self interest.
I like to believe that these institutions - regulators - know better then to cover their asses, because if that was protocol until now for sure there would be a lot of problems with medicines and vaccines.
At leas the European ones (the cases I know) seem to have been pretty competent on their jobs, so I doubt that is a motivation.