Just to be clear, this is a violation of the fundamental ethical principle in clinical trial design called "equipoise."
Equipoise means that no-one is exposed to excess risk just to test the therapy. That's specifically *why* vaccine trials don't use placebo arms.
Ethical violation as POLICY.

Robert F. Kennedy Jr will require all new vaccines to undergo placebo testing, WaPo reports
U.S. Health and Human Services Secretary Robert F. Kennedy Jr intends to shift the way vaccines are tested, The Washington Post reported on Wednesday, citing a spokesperson from the HHS.