The CDC director, for one:
But beyond that, on what do you base that the first wave is slowing - half of all US deaths occurred in just the past seven days.
This Chinese study:
A modelling study to forecast COVID-19 spread in China and inform decisions on relaxing restrictions, predicts a second wave that could require greater restrictions.
www.contagionlive.com
Suggests (plausibly) that if it could happen, and it will be even harder to control it.
But mostly because of NassIm Taleb, who is not a doctor or a scientist, but someone who "gets it" with respect to risk profiles resulting from complex systems colliding.
ZeroHedge - On a long enough timeline, the survival rate for everyone drops to zero
www.zerohedge.com
Yes, it's Zerohedge, but you should read it anyway, because it is a fascinating intellectual walk around the outside of the Covid-19 box. You might find quite a bit in there that you can agree with. Essentially he is saying the responses everywhere were "too little" and "too late." I'm paraphrasing but it boils down to - we started out behind the curve and we're still there, because we didn't take the appropriate step of immediate travel restrictions and a REAL lockdown - where nobody goes anywhere for a month - so we're going to be stuck with the problem for the foreseeable future. I don't see anything in "the data" that makes that seem unfounded.