People turning it down would happen anyway once the reports started coming out. By withdrawing it pending more data, when (if) it comes back to market there wil

People turning it down would happen anyway once the reports started coming out. By withdrawing it pending more data, when (if) it comes back to market there will be increased confidence that it's been properly vetted. At least, more confidence than if it was left on the market as clotting reports continued to roll in. I don't think there's really a good answer here though. It's balancing human lives in the basis of imperfect data and predictions of human behavior.