Worried about when we do need to believe the scientist and we won’t.
They cried wolf.
There was global cooling in the 70's, the population bomb, avian flu, swine flu, global warming...
The left has taken over the mouth of science and used it to sell every crisis they could come up with. The one unifying theme is that people need to give up freedom for some "greater good"...except they've all been scams.
You're right, even if there were some real emergency science has lost it's credibility to provide an alarm to it.