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I don't think people will ever allow a brain to grow in a test tube, at least not something that can have a conscience, only insect-like brains developped for special purposes. Growing a biological or nano-electrical brain that could have a conscience would not only pose great dangers (that it could turn against us), but even if these dangers could be controlled it would pose ethical questions whether it is morally justified to contain a brain with a mind comparable to ours in a test tube, or connected to a machine.
I has never be a problem when the human kind has invented the H Bomb. When leaders say we can do it or we have to do it..then we do it. So i don't think we can talk about "ethical" or "morally". Humans just do the things when they think it's good for them. They don't do when it's not good for them. They need oil for car ? no problem, they start a war in a country where there is oil. They don't need no more oil ? no problem, them kill fishes by jerking off oil in the sea. Do you think all this is moral ?