It sounds bad, but i wonder what the alternative is? Most places are quarantining new arrivals, nursing homes, hospitals, prisons etc so I understand why they feel they need to quarantine. I also wonder how many of them who has been under near constant quarantine would be anyway due to dangerous behaviour, regardless of covid.
This place probably holds some of the uks most troubled and dangerous children, children that have committed serious sexual assaults and rape, children that have killed, children involved in terrorism, arsonists etc, I don’t think the article is as clear cut as it seems, just because they are under children under 18, does not somehow make some of them not as dangerous as adults in a adult prison.