It might strike you as racist, but is well documented in the historical papers of Holland and Suriname. At least a decade or so ago I had this same discussion with Gautam of
And if I read the same documents I would see descriptions of blacks as being lazy, and child like and violent. I don't think that the perspectives of 19th century white men on non Europeans is that interesting.
For instance the Fula people were seen as more "intelligent" because of their more Caucasoid features, and people from Ghana to be more "savage" because they objected most vociferously to be enslaved and accounted for a disproportionate % of the leaders of the rebellions. Congo slaves were favored as they were seen as stupid and more easily forced to endure harsh labor conditions.
It makes no rational sense for planters from a colony with few white men to DELIBERATELY set out to recruit criminals out of India, at a time when labor relations with the ex slaves were poor.
In any case are you going to argue that today's Australians are more depraved than the English because a good % of their ancestors were convicts?