How could this be achieved against an airborne illness that children are largely asymptomatic for? This is true of many adults too - you can't really guarantee that the elderly will be safe unless they can be quarantined, which for almost all simply wasn't possible. Assisted living homes were the first place COVID tore through, which are largely sequestered from children.
If you don't think you can quarantine old people and people with actual immune system issues, why do you think you can quarantine healthy children?
I honestly don't think either could have really been achieved. But it's illogical to recognize that it's impossible for one group to justify pulling out all the stops to quarantine children.
Why would I respond to you when you ignored my central question and then misrepresented what I said? I said you can't quarantine old people and then act as if everything is business as usual in the outside world - the disease will get in.