"Teenagers" is a pretty tight age-range and those Philadelphia riots were large enough to overwhelm the police; if that age range were expanded to 14-70 and a similar percentage of that group were rioting, then that is a massive riot.

A curfew was implemented during the 1992 LA riots and enforced by the California Army National Guard. I think that is the sort of situation which you are describing, and I think that a curfew is appropriate in that sort of situation.

Would I be casual about it? Casual is a weird word; nothing about that sort of situation is casual. I would support such a curfew however.

I suppose many of them would.