I don't think it always works in practice. The problems in Europe with foreign workers that meet prejudices are that they are not integrated. There is racism both ways. Much of this is based on prejudices the Arabs believe in many things. Before Jews were allowed to travel to Cairo, many Arabs thought that Jews had horns.
Prejudices are crucial for understanding racism .
Practical philosophy may contribute here, but not all philosophers. That would have been nice, but in practice it is not possible. Conclusion Kripke is a peculiar man with a sharp intellect. He talks fast and he thinks perhaps even faster. One is still stricken by the fact that he does not seem vitally concerned about applying philosophy to social issues.