This..

>"kids don't get sick from it"

..isn't strictly true. A quick look at the local (Danish) health department says that the hospitalisation rate of 0-9 year olds are 181 out of 17004 confirmed cases and 10-19 yo 180 out of 36065 confirmed. 23% of those had an underlying disease.

Hospitalisation is defined as someone who have been hospitalised for at least 12 hours with something covid related inside 14 days from a positive test result.

So while only something like 1% needs to go to hospital compared to 27% of the 70-79 age group they do get sick and so get long-term damage too.