The role played by humans on the training side is of little interest when considering the technology from a user's perspective.
Years ago, my GF asked me why we bother with judges and juries, given all the uneven sentencing practices and other issues with the current legal system. "Why can't the courts run on computers?" This was back in the pre-Alpha Go era, so when I answered her, I focused on technical reasons why Computers Can't Do That... reasons that are all basically obsolete now, or soon will be.
The real answer lies in the original premise of her question: because Humans Also Can't Do That with the degree of accuracy and accountability that she was asking for. Our laws simply aren't compatible with perfect mechanized jurisprudence and enforcement. Code may be law, but law isn't code.
That problem exists in a lot of areas where people will be looking to AI to save us from our own faults. Again, this has little to do with how training is conducted, or how humans participate in it. Just getting the racism and misogyny out of the training data isn't going to be enough.