[largesse]

It's a slippery slope. Right now is voluntary, but there's a very good chance that if it happens more often, police will find public support for arresting people who don't comply.

The news media is making it worse by taking "lockdown", a term that originated in prisons and then appropriated by schools and throwing it around in this context.

Schools, at least, have some sort of legal basis for restricting movement as they are loco in parentis for minors. There is no legal basis for doing this to adults in cities short of an actual declaration of martial law.