Why do we work and pay tax in South Africa ?

A Zimbabwean arrives in Jo'burg as a new immigrant in South Africa . He stops the first person he sees walking down the street and says, "Thank you Mr. South African, for letting me in this country, and giving me free housing, food, free medical care, affirmative action job and free education!"

But the passer-by says, "You are mistaken, I am a Nigerian. I'm just here for the free medical care"

The man goes on and encounters another passer-by "Thank you for having such a beautiful country here in South Africa !"
The person says, "I'm not South African, I'm from Mozambique . I'm just here for the free housing"

The new arrival walks further and the next person he sees he stops, shakes hands and says, "Thank you for the wonderful South Africa !" That person puts up his hand and says, "I am from Botswana, I am not a South African .I'm just here for the free education"

He finally sees a lady and asks suspiciously, "Are you a South African? She says, "No, I am from Ghana !"
So he is puzzled and asks her, "Where are all the South Africans?" The Ghana lady looks at her watch, shrugs, and says..."Probably at work!"