> However, the Swedish decision makers seemed completely unaware of asymptomatic carriers, which led to the at risk (largely old people) being heavily exposed anyways due to the asymptomatic younger workers around them infecting them.

Not unaware, but actively denying that asymptomatic carriers exist and trying to discredit reports saying that asymptomatic carriers play a role in the spread of covid-19.

https://www.svt.se/nyheter/vetenskap/tegnell-domer-ut-italie...

https://www.svd.se/oklart-om-viruset-smittar-aven-utan-sympt...