You are right, many species of both plants and animals are taken to places for which they were not born, simply because humans arbitrarily decide to do so, and then things like the ones you describe happen.
The weed is a human concept, it is nature and it will do what is necessary because it is the original weed on the planet. May it be the best for the earth.
What matters is the planet, without it there's nothing else right?
That's right, but most of them don't care... the earth will swallow them up... I'm so bad...