Black men and white women couples don't last because both sides have to deal with family issue and social issue more than their counterparts. Most of us black men have stong ties to the women in our family from our mothers to grandmothers and aunts and great aunts.
I disagree many bw may prefer for their sons to marry a bw (which is only natural ) but bm who are marrying ww are not being rejected/disowned/ by bw. Many of the same black mother's end up having a hand in raising those mixed kids.
My own aunt told me one of the relatives who married a ww had found a better wife in her than many bw that she knows. My own mother was the reason that my uncles marriage to his Italian wife lasted as long as it did after all the BS he put her through.
Every day I see bw far more accepting of ww who marry into their families than the reverse. I am not claimin that there is no racism or animosity but a lot of dudes that i know that are in these relationships and it didn't work out was because they are not faithful men.
BW don't have that much power of BM if they did they would make them marry them and stop abandoning their kids.