Ethical injunctions are rules not to do something even when it's the right thing to do. (That is, you refrain "even when your brain has computed it's the right thing to do", but this will just seem like "the right thing to do".)

For example, you shouldn't rob banks even if you plan to give the money to a good cause.

This is to protect you from your own cleverness (especially taking bad black swan bets), and the Corrupted hardware you're running on.

Sequences: Ethical Injunctions

Ethical Injunctions Sequence Summary

Why Does Power Corrupt?

Power corrupts is well known folk wisdom. This post gives an evo-psych explanation. Corrupt behavior provides a fitness advantage, but signaling corruption makes it hard to get power. The cleanest way to not signal corruption is to honestly believe that one will not be corrupt. Thus the fittest strategy is to couple an honest desire to do good with a tendency to find the common abuses of power pleasurable.