Something I've said before: believing that you are a good person is dangerous, because it makes you likely to assume that what you're doing is also good just because you have good intent.

It's better to focus on trying to do good, to keep learning and adjusting.

"who would willingly attack themselves to prevent their own abuse of the power they've newly gained? Only a rare few, I doubt that will change."

Of relevance - the "least privilege principle" in computer security involves designing the system to prevent itself from doing anything which it isn't outright required to do. It involves the host of a service to even lock themselves out of as much potential access as possible (for example via end-to-end encryption).