Another decision by creeping assumption perhaps?This is an ongoing confusion/conflation. Doctors and epidemiologists aren't policy makers or population control experts. The medical advice is "we've found the virus is frequently transmitted where larger groups of people gather inside a house for a few hours, like when these idiots insist on throwing parties at night". It's then up to the government/police to come up with legislation and tactics to prevent these gatherings from happening.
So it's a policy or tactic created by the appropriate people in response to medical advice.