Invasive species are a good thing. It means Nature is putting the most suited organisms in each changing environment. This is the natural way of things going back to the start of life on Earth. Species are meant to move around, and should not be confined by humans to any one place. We should stop trying to control everything. It won't work in the long term, and will only cause more ecological problems. Nature is the best at deciding what species should live in what parts of the world. Humans like to label things "invasive" or "problem species", and justify harmful policies like mass killing ("population control"), genetic modification, tagging and tracking, etc. We are not God and should stop trying to be.