Science can provide the tools we need to build the future. But tools can be used for good or for bad. Tools of science are no less constructive, and no less deadly. The Greeks were quite right there. Unless there are slaves to do the ugly, horrible, uninteresting work, culture and contemplation become almost impossible.
Human slavery is wrong, insecure, and demoralizing.
On mechanical slavery, on the slavery of the machine, the future of the world depends. And indeed these mechanical slaves have revolutionized the way we live. My Dad, who was high tech for his time, used this very heavy mechanical calculator to add, subtract, multiply and divide. It makes a powerful noise when dividing, I will say, with gears spinning and carriage clunking as each digit is found. This hand calculator I carry in my pocket has 64Kbytes of storage, and works at about a megabit per second.