I think it would really help both in terms of outcomes as well as the perception of police if they gave this kind of clear description of what's going to happen. As it stands now, the curfews aren't enforced with any kind of regularity, so they just cause confusion.
Say you have opposing factions protesting each other (let’s say people seeking independence versus those who want to remain a colony somewhere). Should police just allow them to beat each other or instill some order?
Some places have teen curfews and such and I’m not sure they have been struck down everywhere, so I think the lagality varies by jurisdiction.
It is an interesting question with intersectionality with remain in place orders as well. Can the gov keep you from going places? Seems most states have had some shelter in place orders.