I found some paternal cousins of "mixed race" while doing genealogy research, and I automatically assumed the worst. Even told my siblings about how those ancestors were "obviously" slave-owning rapists at some point in the past, despite how I hadn't found evidence yet of them having slaves going back to the 1700's.
After further digging, it turned out that one of my distant uncles married a black woman despite how it was illegal in Virginia at the time. Also learned that the family were abolitionists while living among Quakers in "Loudoun Valley" of Virginia.
It's true that a very high percentage of African Americans have European ancestry, though. Henry Louis Gates Jr. has talked about the statistics on "Finding Your Roots" and elsewhere. Many are the descendants of white slave owners. 
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