Australia is also very picky about the import of food, etc. Their agricultural industry is important and as an island, they can impose strict controls and enforce them effectively. It's their right to prevent the importation of diseases from abroad; visitors have a responsibility to learn and obey the rules--or they should not attempt to visit Australia.

OT, but there are also strict rules about the import of pharmaceuticals. Some substances that are OTC elsewhere are banned in Australia. Again, it's the traveler's responsibility to "know before you go."