The protestors are in the age demographic that are by far least affected by the virus.

“We estimate that susceptibility to infection in individuals under 20 years of age is approximately half that of adults aged over 20 years, and that clinical symptoms manifest in 21% (95% credible interval: 12–31%) of infections in 10- to 19-year-olds”

https://www.nature.com/articles/s41591-020-0962-9

https://www.cdc.gov/nchs/nvss/vsrr/covid_weekly/index.htm#Ag...