Funny, but the truth is that a responsible gardener does not plant things which will escape and take over natural areas..which is what Pampas and Jubea grasses are doing in areas where they rapidly spread..and a responsible nursery will not sell things which will only cause problems..for everyone including the home owner..
Then again, there are still people who believe that there isn't anything wrong with Kudzu...or that "wonderful" bamboo which would take over neighborhoods if it got the chance.. perhaps these are the people who want that other grass legalized..