It's well-established scientifically that lockdowns and other non-pharmaceutical measures reduced transmission and deaths considerably.

https://www.science.org/doi/10.1126/science.abd9338

https://www.medrxiv.org/content/10.1101/2021.01.15.21249884v...

https://bmcmedicine.biomedcentral.com/articles/10.1186/s1291...

https://www.nature.com/articles/s41562-020-01009-0

https://www.thelancet.com/journals/laninf/article/PIIS1473-3...