Our small population means we've produced few world renown people warranting commemorating by the ultimate tribute of a statue, a well located bust being next best.
If the standard is global fame, then only Ed Hilary justifies one. His name crops up frequently in foreign literature, in the sense of "Do you think I'm Hilary? That's some task you're asking of me." Kiri is world renown in opera circles, and to the wider Australian and Britain public, but not in any Callas sense.
Ernest Rutherford, who's on our $100 banknotes, ironic considering the infantilism here to things nuclear, is unknown beyond the physics world, his accomplishments being largely a team effort.
Our sports journalists voted Peter Snell as our 20th century top sportsperson but outside of athletics buffs, his name means nothing abroad, as is the case with other record-breakers or gold medallists. That said, I once met an Irish woman whose life revolved around equestrianism. She was adamant that Mark Todd was the greatest equestrian in history, which was certainly news to me. The greatest in history in anything warrants a statue, unless it's mass murder, although that hasn't stopped Mongolians idolising Ghengis Khan or the French, the war-mongering Napoleon.
A main Wellington thoroughfare has a statue of Queen Victoria. It's part of our history and there'd be a carry-on were it removed. On the other hand there's an absurdly inappropriate statue of Ghandi outside the Wellington Railway Station, donated a decade back by the Wellington Indian community to be placed on the waterfront. The mayor despaired, knowing it was ludicrous. I hammered her to refuse it but she weakly settled for it at the railway station to appease the Indians. It should be removed, being utterly irrelevant to New Zealand. There's a large Wellington Indian hall where it would be fine outside. So too a proposal a decade back for a statue of Mandela in central London. Jeremy Clarkson rightly kicked up a fuss on the same grounds, namely total irrelevancy to Britain, and it was dropped.