The ubiquitous purpose of #lockdown is that it gives time to prepare the health system to meet any potential surge in cases. It is the only greatest unequivocal advantage.
Most countries weren't prepared fully to meet the surge in #COVIDー19 cases
Fact: #lockdowns can only reduce the rate of transmission. In addition, flattening is further decided by human behaviour (implementation), density and clustering of cases (dispersion index)etc
Fact: There are huge social and economic costs. No country can afford to continue lockdowns until either a vaccine or drug is available; real purpose of a lockdown is to prepare better.
Fact: This is natural, Virus will spread when susceptibles are there. The health system is ready to meet the surge in cases and reduce mortality. There will be more cases while you relax the lockdown norms.
Fact: Read the above tweets. The assumption is flawed. Decreased Ro and increased doubling time are parameters to assess the success, not the number of cases.
Fact: The goal of national efforts are to reduce mortality. Purpose of lockdown is to prepare the health system to meet this goal.
The argument "do nothing" is unethical; Details in this thread