Based on the article, you can reasonably infer that black South Africans

who participate in land takeovers are doing so to.

build wealth for themselves.

Explanation:

Black South Africans suffered under apartheid for most of the 20th century, a system of strict racial segregation enforced by the government. One of South Africa's most murky unresolved problems is of land reform. A latest government survey revealed that 70 percent of the land is held by white farmers. Resentment over that basic inequity is the reason that led to land confrontations such as the recent takeover of Stefan Smit's Stellenbosch farm. Black South Africans were desperately want to build some wealth for them.