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?