Picture this. You work for the witness protection programme and have to find somewhere where the Williams family can live without drawing attention to themselves. So out of thousands of potential towns in the USA, you decide to put a black family in the most white community in existence and don't expect them to stand out? Haven't you just made a completely daft decision to put them there? Knots Landing was so white that after Jill's death, a witness told Mack she saw a black man watching Jill's apartment and without hesitation Mack visits to Frank to ask him why he was there. Frank clearly must have been the only black man in Knots Landing to justify Mack's assumption because up to that point he had no reason to suspect Frank. Doesn't it seem unnecessarily risky to put the Williams family in a area where they would stand out so conspicuously.