We're supposed to believe one hubpages articles that doesn't cite any sources other than this guy who claims to work at the national park? Sorry, I need better sources than this to be convinced.
Then search the internet for sources - there are many. I cannot search properly (because it turns out the a country full of elephants has a lousy (and expensive) internet connection). Elephant culling has been widely debated in most countries. It is no secret.
The Kruger National Park even had a programme where they even tried to use contraceptives for Elephant Cows... What is next? An abstinence program?