It's so funny when they try to argue that the conditions around it are somehow different and make it unethical. Like yeah, I'm against fascism and climate change, but all our previous tooling was also built on unethical grounds, this isn't any different. You like trains? The railroads were built by slave labor, extracting the fuel displaces indigenous people and hurts the environment, and folks like Carnegie used their train-powered wealth for their own personal benefit to the detriment of the public. Does that mean taking a train is unethical?