They all think in terms of statistics. They expect a certain amount of adverse effects. The fact that there is even a rumor of them considering this matter means to me that it is pretty bad, it is outside their expected range, and it is extra upsetting that it seems to affect younger people, because they are about to go for children and babies who didn't for the most part even need it. Not only could it cut into that big market, but if kids start getting hurt it will cause more outrage than older people kicking off suddenly. There is a plausible deniability there, for a while. Not forever.
Specifically... They expected heart inflammation.
They all think in terms of statistics. They expect a certain amount of adverse effects. The fact that there is even a rumor of them considering this matter means to me that it is pretty bad, it is outside their expected range, and it is extra upsetting that it seems to affect younger people, because they are about to go for children and babies who didn't for the most part even need it. Not only could it cut into that big market, but if kids start getting hurt it will cause more outrage than older people kicking off suddenly. There is a plausible deniability there, for a while. Not forever.