Once again, you believe that what you see is the whole picture. RD is a rather large nation, and the pictures vary.
I counter your assertion, and say persons have been going to the beach, and have not been arrested, in certain regions. Persons, not large groups.
Recently, I have been out and about past 7pm, and have not been detained.
Perhaps your community has tighter restrictions than others.
Things vary greatly even within communities. In Sosua, for example, there are very tight restrictions generally thoughout the whole of El Batey. But not so much in Charamicos, Sosua Abajo and Maranatha (aside from Highway 5). Get off the highway in those 3 areas and it's quite a bit different.