Generally, ethics is the responsibility of the arbitration committee. The standards they are expected to use are Wikipedia policy and common sense. There are issues, and invading someone's privacy is certainly a major issue.
Checkuser abuses of privacy are handled by the Ombudsman Commission
http://meta.wikimedia.org/wiki/Ombudsman_committee
Fred
What is this ethical committee supposed to do? If it finds editors being unethical, does it admonish them in private? Name and shame in public? Block or ban? And which standard of ethics is operated? Christian ethics, or western secular humanist ethics? What about Islam or Hinduism?
As you may see I don't think this has been thought out. "Hard cases make bad law".
-- Sam Blacketer London E15
That is why, given all the "hard cases" we deal with, we do not make or conform to precedent.
Fred