Did you read the article? Yes, ecosystems can be fragile. New Zealand has (rightfully) decided to protect theirs, even if it means a slight inconvenience at the airport.
Of course they have a right to do whatever, but I'm just saying it seems like a losing strategy. Bugs and Birds get blown off course, rats sneak on ships, etc. all the time. Just saying it seems like an impossible task to police this...
Certainly an immensely challenging task, but hopefully not impossible. We have hardly begun to apply new technology to the problem - drones, new lures, mesh networks, low cost cameras.
Also we've stopped those pesky Victorians from introducing new species. Its a good thing they never introduced wildcats to control the stoats, weasels and ferrets - which they introduced to control the rabbits - which they introduced to give them something to shoot at on quiet Sunday afternnons.
