There is nothing ethical about killing an animal to satisfy ones pride.
Pride is one of the 7 deadly sins.
“Of the seven deadly sins, pride is the only one with a virtuous side. It is certainly a good thing to have pride in one’s country, in one’s community, in oneself. But when taken too far, as Michael Eric Dyson shows in Pride, these virtues become deadly sins.”
It is hard to see inside another’s heart from a distance. I do not think legal elephant hunting satisfies the criteria for a sin of pride, by itself.
The hunter followed the rules prescribed by the Zimbabwe government. He did not waste the meat, hide, or ivory; and he did something that needed to be done.
All pride is not sinful. Excessive pride that puts the person above God, is.