Because big city lawyers will lay down fat cash to kill the legendary wild boar.
Seems to me there ought to be a law against bringing in more of an animal that is already a nuiscance... wouldn't it probably be cheaper for them to round up some of the local feral beasties and let the tourists shoot them? I doubt the "big city lawyers" would even know the difference...
Some people are like Slinkies - not really good for anything, but you still can't help but smile when you see one tumble down the stairs.
A gun should be a tool in the hands of a deadly weapon, not a deadly weapon in the hands of a tool.