They are useful for toilet paper in a pinch, I will give them that. While they have been here a while, they still displace native plants and their associated insect species. Letting them persist will push them into more habitats and ecosystems that they will distrupt. Some bees, mostly invasive honey bees, may be attracted but native bees need native flowers. Native moths, butterflies, wasps, ants, etc need native plants to grow and place their young. It can never be a zero sum game, but they still do harm. Cheers.