And South-Korea also was the first country where the virus came back.... With a vengeance. A letdown in quarantines is that nobody builds up resistance against the virus and that is the only thing that can combat a virus (FACT!) We already know that Corona is here to stay, it will never leave, so you can do the South-Korean thing as much as you want, but all you get back for that is that you'll have to lockdown completely every two months or so. All all in all the South-Korean measure caused the opposite of what you want. What is true though, and there Korea had a few successes is that Korea was also more keen on checking for the virus. Quaritining when you don't know where the virus is, is pointless. It's like fighting a war with no clue at all where the enemy is, guaranteeing your demise.
And the Spanish Flu came in the middle of WWI, and that alone made things impossible to act upon properly. As we are not in a World War situation now it's hard to compare, but I give you another fact related to the to world wars. WWII came for a large part due to the worst economical crisis the world has ever seen. A crisis that is close to match that one is one its way, and possibly even worse than that one. Yes, it is possible WWIII can start as a result to that lockdown as a result. Of course, this is only a remote possibility, but bad economical situations have quite often been reasons for war, so WWIII can be a worst case scenario result, and then even more people will die. Now this is the ultimate doom-scenario, not too likely to happen, but one we may not rule out either. 99% of WWIII stories have been proven bullshit, but this particular one is quite real, even when the chance is low.
Economical crises alone will also threaten lives, with or without WWIII. Most of the world have health care systems in which tax money is involved, and those systems are always the first to meet budget cuts. Yes, that also threatens human life. Also the lockdown has also proven an increase of violence in home situations. A lot of murders over time have been caused by such situations, and so the lockdown again, threatens human life. The list of the lockdown results with terrible and even lethal results is endless. That altogether, especially since many deaths in the future years may be direct consequence of this lockdown, will very likely outrank the top number of deaths the virus itself could cause by far. To see this, one must only be able and be willing to think ahead.