Some people are saying because this man was not technically a poacher but a hunter, who is backed by the local law, because he pays to be able to kill the animal, then that makes it okay. Zimbabwe is making money! It should be okay. The hunters are really helping the animals, and will list a bunch of reasons in the ways their money for killing helps. Protecting them from starvation (elephants can migrate, droughts can change, nature works out, it's not a mercy kill). Protecting them from others (but not yourselves). Protecting property (like a fence would).
Nope. You're just paying for the privilege to kill, whereas the poacher won't. Hunters have been known to collect the ivory afterwards for their trophies or even to sell and work them. Both end with the animal being killed unnecessarily.
Zimbabwe can get its money elsewhere for this. Like more safaris, or having its army train on poachers.