yeah that makes sense. And it became clear in the beginning they weren't completely isolationist since they rely on members to go to the outside world to gather new members/victims :( Really loving this movie more and more I think about it
I think without that particular line it leaves open the possibility of assuming that although some members go out, the rest/majority still largely detached from the outside world, whereas that line removes that possibility and makes it clear it's seemingly accepted within the community as a whole.