Earlier quoted context omitted.
Presumably the cases are so low precisely because we have enacted these measures. If we had not done that we'd probably look more like New York right now. The more effective your measures are, the more it is going to look like they were unnecessary. Or to reuse your metaphor: A campfire can turn into a wildfire really quickly. If we hadn't thrown the tsunami onto it when it was the size of a campfire, we might have g…
New York was only a few days behind California. Density matters so much that it's going to take a long time to arrive at good answers for how much lockdowns affected this, and there will be very strong pressure for a long time not to arrive at any conclusion other than "it worked", regardless of whether that's the truth. Which, obviously, it might well be!
Acting early enough trumps everything else.