Because the agitators would rather bring down whitey than bring up themselves.
Amnesty is the greatest example of this. The millions of potential new citizens overwhelmingly live in urban areas (next to blacks) where they will take jobs formerly held by black people. Amnesty will undoubtedly increase black unemployment. These new citizens, who are overwhelmingly minorities, will also take affirmative action slots from blacks. Black liberal leaders don't care, though. In their minds the millions of new citizens are overwhelmingly People of Color who will band together with them to topple white control in America.
“The millions of potential new citizens overwhelmingly live in urban areas (next to blacks) where they will take jobs formerly held by black people.”
There’s always a silver lining to any dark cloud