They don't need outsiders. Most police would happily confiscate your firearms and kill you if you resisted. In Nazi occupied France who did most of the work rounding up Jews for the gas chambers? The French police. They worked hand and glove with the gestapo. Now you say they're French and what can you expect, but they were just as human with the same motivations and feelings as we have.
“Most police would happily confiscate your firearms and kill you if you resisted.”
That is an ignorant generalization. Both of my sons are cops and both have told me that they would refuse such an order. As have their colleagues. You don’t know what you are talking about.