If we were to abolish all ethics, humanity will be able to answer many scientific things about the human body (And possibly augment it) that would have taken decades and possibly centuries to answer.
A government could allow scientists to experiment without legal repercussions, but that doesn't eliminate ethics. Ethics we have either been born with or taught our whole lives cannot be thrown away at the drop of a hat. This scenario would be near impossible.
We do not have free will since everything that happens is determined by what has happened before.
Scientists are currently operating on the idea that quantum indeterminism is true, having performed several studies on the molecular level, but either way, we still probably don't have free will. Neither determinism nor indeterminism is completely compatible with free will.
That history is important to study.
History should be about learning "how things become what they are" and helping us dig out ideas and concepts to help us live better lives in our own time. I am not saying history is taught correctly, but it is important to study it for this reason.