Before 1994, the whites of South Africa enjoyed a lot of privileges and the blacks of South Africa were actively discriminated against. When came the time to draw up a new Constitution, the whites would have wanted to protect these privileges as much as possible and the blacks would have wanted to take back those same privileges.
Drawing up a Constitution that would accommodate both views must have been quite difficult because they oppose each other and needed a compromise. Essentially, there was a need to draw a Constitution that would not enrage either race such that open hostility erupted between either of them so this was also a matter of preserving the peace.
The factors that influence when and if a person experiences symptoms from a particular exposure are : - The amount of time you come in contact which has an effect - The complementary symptoms that occur