Professional ethics aside, how about plain old personal ethics? Do programmers have a higher incidence of unethical behavior in general than the rest of the population? I agree with you that it seems like there could be a more rigorous professional standard for enforcing ethics in coding/CS, but I like playing devil's advocate.
No idea, but a lot of developers and other tech people suffer from hubris, believing that since their cognitive skills make them effective programmers, they are in turn equally insightful in other domains because all thought depends on logic.
The problem is that it's very easy (and socially acceptable, even desirable) to build elaborate towers of logic on an unexamined premise.
TBH making the ethical choice may not even be the logical one. That's why it helps to have some education on the topic, as it inevitably involves making the less 'obvious' choice.