That 'just' is where the valid concern lies. Nine women cannot make a baby in one month, and one important reason vaccine trials take the time that they do is to observe for side effects within the test population. You can't give ten people a shot, watch them for a month, and draw conclusions on the effects that will show up in an individual in ten months time.

There is no shortcut for that, and there is an obviously huge pressure to cut corners.

It's fair to be concerned, not anti-Vax.

I'm definitely not antivax. I've gotten pretty much every common vaccination. In my view there is a difference between antivax and a new drug or vaccine that has not been widely tested.