I’m not aware of any evidence that education in ethics leads to more ethical behavior though it obviously leads to being able to discuss ethical problems better. The evidence suggests ethicists steal more books than other philosophers[1].
]1] Do ethicists steal more books? Eric Schwitzgebel
If explicit cognition about morality promotes moral behavior then one might expect ethics professors to behave particularly well. However, professional ethicists’ behavior has never been empirically studied. The present research examined the rates at which ethics books are missing from leading academic libraries, compared to other philosophy books similar in age and popularity. Study 1 found that relatively obscure, contemporary ethics books of the sort likely to be borrowed mainly by professors and advanced students of philosophy were actually about 50% more likely to be missing than non-ethics books. Study 2 found that classic (pre-1900) ethics books were about twice as likely to be missing.
In any case, this paper covers most of the objections you are raising and answers them quite well, IMO:
It's par for the course in tech, unfortunately. I think tech leadership in particular would benefit from a rigorous education in ethics.