The WHO says there is only one worse thing than a bad pandemic, and that's a bad vaccine.
Because not everybody is exposed to the pandemic, but in principle everyone is exposed to the vaccine.
That doesn't counter your point, but we'll need up to phase 3, to have enough coverage to make sure your statistics hold.
But indeed, the risk seems to be balanced against 5 years waiting for any long term symptoms to show.
It seems like there's a real chance everyone will be exposed to this pandemic sooner or later. My take is calculate the risks and act accordingly. Arguing moral priors first and statistics second is best reserved for when people aren't already dying in droves.
That doesn't counter your point, but we'll need up to phase 3, to have enough coverage to make sure your statistics hold. But indeed, the risk seems to be balanced against 5 years waiting for any long term symptoms to show.