You know they're not a long standing tradition in South Africa. They're a recent phenomenon.

The problem is that no one wants offend an African Nation. I read a few articles on it and that seems to be the reason they wont be banned.
It has become the unlikely symbol of South African football, yet has divided local opinion and deafened tens of thousands of visitors to the 2010 World Cup. The buzzing of the vuvuzela — a cheap, plastic, monotone trumpet — is the incessant accompaniment to every match.
South African spectators do not require the excuse of a goal or a thrilling moment to puff out their cheeks and blow. They simply drone on, and at a collective noise level that would rival the engines of a Jumbo jet.
The racket is driving players, broadcasters and visiting supporters to distraction — so much so that the South Africa World Cup Organising Committee has warned that the trumpets might have to be banned. Fifa, football’s international governing body, issued an edict two weeks ago that the vuvuzelas must not be played during national anthems or stadium announcements.
But Danny Jordaan, chief executive of the organising committee — and the most powerful man in South African football — went farther yesterday, as he wearily admitted that he had had enough of the infernal noise that makes the stadiums resonate like gigantic beehives.
“We have tried to get some order,” Mr Jordaan said. “We have had some broadcasters and individuals complaining and it is something we are evaluating on an ongoing basis.”
With at least 650,000 vuvuzelas having been sold before the World Cup opened, a ban would seem impractical, and Fifa insists that this would happen only if the instruments were used as missiles or weapons. Fifa is also reluctant to take action against such a distinctive cultural symbol of the South African people.
Nor would a stadium ban stop the South Africans blowing their vuvuzelas at every opportunity in the streets — and frightening the life out of unwary shoppers in city precincts and drinkers in bars and hotels.
Patrice Evra, the captain of France, has said that the noise is preventing the players from hearing each other on the pitch and is keeping them awake in their hotel. Team coaches have complained of the sheer volume. South African fans claim that it is their twelfth man on the pitch when their beloved Bafana Bafana, as the home side is known, play.
At Oliver Tambo airport in Johannesburg, Lucky Madonsela, a South African Airways check-in agent, greets passengers with a blast of his vuvuzela. “The best way to avoid the noise is to have your own vuvuzela,” he said. “While you’re blowing you can’t hear the noise. It is our singing — we sing with the horn.”
But it is the human voice — raised joyfully in song — that Mr Jordaan wants restored to South Africa’s stadiums. “It has always been a great generator of a wonderful atmosphere in stadiums and I would encourage them to sing. In the days of the struggle against apartheid, we were singing. All through our history, it was our ability to sing that inspired and drove the emotions.”
http://www.timesonline.co.uk/tol/sport/football/international/article7149593.ece
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How selfish....