Ask them if they've read about Dessalines, and ask their thoughts on them?
Whether it be the Github user who founded Lemmy, with his Anti-American and Marxist Leninist essays,
or
the Haitian general who fought against the French in the Haitian Revolution, and thus had a hand in genociding many remnants of the white slave-owners... to create the first abolitionist country.
Just ask what they know and what they think of him?
Yep. Completely wiped them out, I suppose, regardless of your views...