This may be from a time when interracial marriage was a hot button issue. If you want to agitate against that, you need to make white guys fear black guys that their daughters, sisters, crushes could actually fall in love with. The fear being played on isn't "a black guy could fuck a white woman", the fear is "somebody from my family could bring a black guy for thanksgiving dinner year after year".
This may be from a time when interracial marriage was a hot button issue. If you want to agitate against that, you need to make white guys fear black guys that their daughters, sisters, crushes could actually fall in love with. The fear being played on isn't "a black guy could fuck a white woman", the fear is "somebody from my family could bring a black guy for thanksgiving dinner year after year".