Israel was always interested in jewish immigrants, white, black or green. Some groups have shown to be easier integrated than others, this goes for all countries accepting immigration. Unscilled immigrants from lets say Somalia is a great challange to every country! Try to see the unjustice that is going on in your own country to start with!
Islamist militants attack African Union base in southern Somalia (Reuters)
from the article: Israel to slash budget for integrating new Ethiopian immigrants