You are painting with too broad a brush. A very successful businessman in South Carolina was a former slave who himself owned many slaves. Torture wasn’t in any way the norm. To be sure some slaves were severely beaten. Whippings were a standard punishment back then. The US Army continued to whip soldiers long after slavery ended. I am not saying a typical slave could have much for aspirations, but there is no need exaggerate the circumstances.
I certainly do not condone slavery, even the comparatively benign version prevalent in southern Louisiana prior to it being admitted as a state, and even afterward to some degree.
But a fit, young, male slave was very expensive; about comparable to a new 100 hp tractor today. It would have been madness for an owner to mistreat a slave too badly. Probably some did, particularly in the “agribusiness” plantations of the Deep South, to which rebellious slaves were sold. But even then, it did not make economic good sense to severely beat, maim or starve a slave. Many plantations had local doctors “on call” to treat slaves who fell ill. It wasn’t a matter of kindness, but of business.
Labor conditions weren’t very good during that era on the low end, slave or free. An Irishman working in a factory of the time faced open flywheels, toxic substances, zero safety measures, and worked for a starvation wage. If he got sick or injured, he was just fired to deal with his situation as best he could, because the factory owner could always find another Irishman willing to work for a pittance.
My own great-grandfather worked in the deep mines in eastern Kansas. It was so hot in there that the men did their work naked. The mine faces were typically less than a man’s height, so a man had to walk, perhaps miles, bent over, to get to the mine face. The mines were full of mice and rats, so the workers had to fight them off to eat their lunches. The carts were hauled by ponies because horses were too big for the shafts. Now and then a pony would go insane and kill miners. If a miner got hurt, he was fired, and that was all there was to it.
Slavery had been abolished, but local blacks would not work in those mines, they were so terrible. The workers were immigrants, most of whom, like my great-grandfather, could not speak English. Undoubtedly slavery was worse than that in some places, but there would not have been much to recommend either one.