Correct me if I'm wrong, but they've never found a treatment for the flu, right? You get it, you tough it out. At least I've never been cured of a flu, despite many, many flu shots.
Nope, the absence of evidence doesn't support anything that you say.
Also, lockdown just kicks the can down the road in the US. Even welding doors shut like in Wuhan just means the epidemic continues after the lockdown ends. Ad nauseum until herd immunity.