In the United States, about 30 per 100,000 children in the age range 10-19 die every year. I imagine it's a bit less in the UK. That's from ALL causes, from suicide to car accidents to pediatric cancers.
If .2%, or 2 in 1000, children 10-19 die from this, that's 200 out of every 100,000.
This means even if only 20% of the population gets this virus, it will kill more 10-19 year olds this year than ALL OTHER CAUSES OF DEATH COMBINED.
More than all the rest combined. And that's with only 20% infected. If it's 60%...
Many more old people will die from this than young people. But there is no age category for which this is not, at least according to current evidence, more deadly than all-causes death for a given year in a developed nation.
You can say "hardly any children will die," but would you say "oh, let your child go to the party with drinking, hardly any teenagers die on average in a year, just a few in 100,000!" or "well, so few kids get cancer, it's not worth getting my kid checked out with these weird symptoms," or "almost no one gets kidnapped, really, may as well not even talk about stranger danger with my kids."
This is more dangerous than every murderer and every misplaced weapon, this year. More dangerous than every drunk driver. More dangerous than every overdose and every eating disorder.