A good friend of mine teaches teenagers and has two of her own. Her perspective is that the weight of opinion among young people is that they have very low risk. Those that have very high risk (weak and old to summarise) are (according to the age group) welcome to isolate themselves but should not impose this on everyone else, as it is damaging their lives, education and well being.
I am fairly ambivalent about it all, but it is certainly true that old v young can logically hold very different perspectives.
Kids can be a lot more sensible than they are given credit for.
I said the same in the original C19 thread back in March/April. If you are old and vulnerable, protect yourself, but don't ruin things for everyone else.