You wouldn't say to someone "how can someone possibly read and enjoy Jane Austin and also Mark Twain and Leo Tolstoy. Or how can someone possibly you write letters to friends and also articles in a newspaper.
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"Race memory" - I just don't believe in it. We make choices as to who we feel drawn to in previous generations, and where our loyalties lie, and ancestry is only one of the factors involved, and not by any means the most important in many cases.

There are clearly plenty of people in America who feel a strong sense of solidarity and loyalty towards with the people and the music and traditions of pioneer America, even though none of their ancestors arrived in the States till maybe a century or more later. And the same is often the case in the various nations of the British Isles.