From what I have heard, keeping cats indoors is far more common in the United States than it is in Europe. American cat owners will keep their pets permanently indoors far more, even if they have a backyard and live in a place where it is unlikely the cat will be hit by a car.
So, if an animal advocacy charity would organize a campaign to promote keeping your cats indoors for the sake of animal welfare, it seems like this could be more effective in Europe than in America. In my own country, I have sometimes seen campaigns to promote spaying or neutering cats (which is also good for animal welfare), but I have never, ever seen one that suggests you keep your cat indoors to prevent it from mauling poor little mice and butterflies.
From what I have heard, keeping cats indoors is far more common in the United States than it is in Europe. American cat owners will keep their pets permanently indoors far more, even if they have a backyard and live in a place where it is unlikely the cat will be hit by a car.
So, if an animal advocacy charity would organize a campaign to promote keeping your cats indoors for the sake of animal welfare, it seems like this could be more effective in Europe than in America. In my own country, I have sometimes seen campaigns to promote spaying or neutering cats (which is also good for animal welfare), but I have never, ever seen one that suggests you keep your cat indoors to prevent it from mauling poor little mice and butterflies.