Three counter-examples do not disprove a statistical argument.
According to Wiki: In the United States there has been an historical disparity between Black female and Black male exogamy ratios: according to the United States Census Bureau, there were 354,000 White female/Black male and 196,000 Black female/White male marriages in March 2009, representing a ratio of 181:100.[21] This traditional disparity has seen a rapid decline over the last two decades, contrasted with its peak in 1981 when the ratio was still 371:100.
I should not that observation would lead me to assume a much higher ratio exists. Possibly non-marriage relationships are not in proportion to marriages.
Whether 1.8x qualifies as “very rarely” is, I guess, a matter of opinion.
BTW, I agree with you completely that such interracial marriages are not unscriptural. All sexual relationships outside marriage are, however.
You speak the truth. It seems like refraining from fornication is considered unnatural, even freaky to the masses. But then, there's very little regard for God's Word in today's world. Narrow is the way...