"It is an attracting concept to think of the cane toad introduction as "reckless and irresponsible." Most biological controls are appreciated and often sought out." -Whitney Baethke
Perhaps if the toad would've solved the problem, it could have been seen as a "necessary evil." However, since its lifestyle was contradictory to that of its intended prey, I think that show a significant oversight on the part of authorities. I have briefly looked for an account of the species' history in Hawaii (where it was introduced for the same problem) but haven't found anything substantial yet.
-Dylan