Sometimes it makes me laugh a bit when they get so high and mighty over biosecurity. I understand their point, but so many places exist and flourish with no biosecurity (all of Europe for a start) and they are just fine - and the fact remains that

Sheep

Cattle

Horses

Goats

Wheat

Potatoes

Peas

Carrots

Peanuts

Rice

Salmon

Trout

Camels

Cats

Mustelids

Rye Grass

Pigeons

Hedgehogs

Rabbits

are just a few things which have been introduced to Australia. Destroying some plants like this is so much a case of locking the stable door after the horse has bolted it is not funny.