Imagine this is the outcome of a production problem, yet regulators refused to acknowledge this until it was out of proportions because the problem wasn't fixed. Not only people would lose trust on vaccines, they would lose trust on the regulator - this extends far beyond this vaccine, but all vaccines and medicines.
People need to feel safe, and to know that regulators are not sleeping on their job. It's not a bureaucratic job, but that they are actively looking at data and reports from doctors.