Well, the vaccine was halted in Germany because the Paul-Ehrlich-Institut, which is not a political entity, had this to say:

"Compared to the status on 11 March 2021, additional cases (as of Monday, 15 March 2021) have now been reported in Germany. Analysing the new data status, the experts of the Paul-Ehrlich-Institut now see a striking accumulation of a special form of very rare cerebral vein thrombosis (sinus vein thrombosis) in connection with a deficiency of blood platelets (thrombocytopenia) and bleeding in temporal proximity to vaccinations with the COVID-19 vaccine AstraZeneca.

The data are being further analysed and evaluated by the European Medicines Agency (EMA).

Vaccinations with AstraZeneca's COVID-19 vaccine in Germany will be suspended until the EMA's evaluation is complete. Today's decision affects both initial and follow-up vaccinations."

These things are not done lightly.