Except there's not. They can believe the scientists or the can believe the conspiracy theory.
The scientists weren't/haven been "fearmongering"--they were reporting their findings, which happen to be scary. Telling the scary truth isn't "fearmongering"--that's nothing but a rhetorical tool used by deniers because they don't have a real argument.
The easiest--if not most transparent--way to attempt to discredit something is to mock it as "fearmongering": don't listen to all those sky-is-falling alarmists! Pearl-clutchers!
So what, scientists are supposed to sugar-coat their findings so Americans won't get to upset?
That always ends well.
At best, it's normalcy bias run amok and at worst just what I just described: an emotionally manipulative appeal for people to ignore... science. And when they get bored with that one they whip out the whole "But it will crush the economy!" nonsense and invoke... fearmongering... about how we'll all be forced to use horses & buggies.
Transparent.