I don't think that is entirely fair. They are operating on what they know at the time, maybe underestimating themselves. Situation is constantly evolving.
Then they speak with that level of confidence. "This is what we believe, but it's not confirmed", "There's a high level of variability and unknowns here".
Instead Trump and cohorts are speaking in horribly over-optimistic platitudes that are based on his _hopes_, not his knowledge - and he doesn't have the oratory nuance to make one sound different to the other.
