1) Replace "children" with "immunocompromised people". It is the exact same argument. Don't be pedantic. And yes, I do believe COVID is overblown in how it is presented. The risk factors are very clear now and nowhere near as bad as they were originally presented, or as bad as people still seem to think they are.
2) You just did it again - stating other people's opinions are "dumb" because they don't adhere to your personal mantra is exactly how you make other people completely disengage. Just like I'm going to do now.