Killing Rhinos to Save Rhinos - Flaw in logic

     Auctioning out permits to kill endangered rhinos in Namibia, in order to save those endangered rhinos is illogical. Five permits have been auctioned to hunt the endangered black rhinos in Namibia, in order to bring in money to the DSC to save the black rhinos species. Now this does have a sense of logic to do this, it sacrifices some to save more. But this is not the case, it is more logical to not issue any permits at all, thus rendering the action of selling the permits illogical. There are roughly 1000 black rhinos left in Namibia, and five permits have been auctioned to kill them. Let’s say the hunter hunts once a week and only manages to shoot two Rhinos per hunt. In two years all the Rhinos in Namibia would be gone. If the hunter hunts once a month, the rhinos would be gone in roughly 8 years. There are 5000 rhinos in the world as you can see.

 Is it logical to kill of 1/5 of the population?