In addition to habitat alteration and destruction invasive species have a huge impact to our biological communities.
I can go in my back yard and find 4 highly invasive species: chinese privet, tree of heaven, multiflora rose, and mimosa (5 if you want to include my grass) right now. I also have English ivy that climbs up my trees and every spring bartlett pear trees bloom, everyone thinks how beautiful they are, and the first hard storm they splinter. They were suppose to be sterile but if you go into the mountain and see white that would be either a dogwood or a pear tree.
Usually if something has fur and a cute face we feel bad about killing them. For lionfish we feel bad because they are beautiful creatures, seem harmless, and hold a value for us. On the other side no one would care if we smashed zebra mussels all day long.
It will be interesting to see if we can have any real impact to their populations but it sounds like we will be using bubble gum to stop the dam from breaking if they can be found in the sea beds, the reefs, and in deeper waters.