Trump only doesn't engage in chattel slavery because the constraints of the times he lives in.

He's obviously got no problem with human trafficking aka 'white slavery'.

Trump is constrained only by constraints that have been put in place to stop things like genocide. Not by any aversion to them. He doesn't lack the mentality, he lacks the mechanism.

Right today, as I type this, he is trying to find ways to withhold federal funds from states for supplying absentee ballots to their residents to disenfranchise people so that he can remain in power is unheard of.