Do people have a right to stay clothed at a nudist beach? Or women wearing tops at a topless beach? The point is we have different beaches designated for different modes of dress. The police should designate a full modesty beach and direct burkini-wearers there. They should remove inappropriately dressed people, but not disrobe them.
The larger point point is that immigrants need to adopt or at least respect the customs of the host country. If not, they can go back to their country of origin.