I saw this article about how opossums were introduced in Brooklyn a couple of years ago to curb the rat population. This ingenious plan has failed and now the same area is over run with opossums. According to the article, "the critters have a mouth full of 50 sharp teeth, tend to exude a foul odor, and can occasionally contract rabies." Yes, exactly what you want running loose around the neighbourhood!! And I do think that captioning the photo as a "marsupial marauder" makes it sound much too likeable.
This whole story reminds me of an episode of the Simpsons, where Bart adopts what he thinks are bird eggs and they turn out to be lizards, which are apparently a threat to the local bird life and should be killed. Bart, in desperation, throws them off a building to set them free, and in a lucky coincidence, they happen to have little wings and safely float down to the ground. The lizards proceed to wipe out the pesky pidgeon problem and Bart is lauded a hero. Lisa brings up the point that Springfield will be infested with lizards rather than pigeons, but is reassured that if that becomes a problem, they'll send in Chinese needle snakes, and if they become a problem, snake-eating gorillas. And then "when wintertime rolls around, the gorillas simply freeze to death."
Sounds familiar...what seemed like an utterly insane idea in the Simpsons has been played out in real life - which begs the question, what should be sent in to stop the opossums?