Lockdowns don't work. Period, full stop. We have been there, done that, and it barely put a dent in the virus. You can slow it down slightly (at massive economic and social cost) but in the end, virus gonna virus - it will spread until it runs out of hosts, or mutates and dies off.
Those saying we didn't lock down hard enough remind me of those who say that communism didn't fail - rather, no one ever tried a pure enough form of it. ;-) Seriously, I can recall a couple of months ago seeing Dr. Scott Gotlieb, a leading U.S. physician, on CNN expressing his surprise and disappointment that the initial March/April lockdowns didn't take a bigger bite out of the virus. Again, it's worth noting that quarantining the healthy has never been tried anywhere until now - this was the first experiment, launched in desperation, and not surprisingly it didn't go too well. The curve of this virus looks pretty much the same everywhere around the world regardless of if, when or how a country "locked down".
COVID is here, and it will be here until we hit some form of herd immunity or science finds a way to intervene with vaccines and therapeutics. We can slow it down somewhat, but we can't stop it. We knew that back in March, when the motto was "flatten the curve", but somehow the goalposts on that got moved to, "Don't let anyone get the virus, ever." That, of course, is doomed to failure.
The bad news is that it is far more communicable than they first thought. The good news is that it is far less deadly (by a factor of at least ten) than they thought. The Infected Fatality Rate (IFR) of COVID may be as low as 0.25%, in fact. Given this, I think that getting on with our lives is a far better option than continuing to light our hair on fire and launching yet more pointless lockdowns.