Found a good article discussing their impact on other fish species and their impact. http://espn.go.com/outdoors/general/..._Springer.html
Given the conservation push, the picture with the guy in the yellow jacket seems poorly chosen.
By the way, I think Alligator Gar are more native to Texas than Largemouth Bass are. Supporting killing them because they are eating bass seems a lot like what was done to the human natives of this state.