Yes, although I think the absence of those power hungry narcissists (who no doubt lurk back at Star Fleet HQ) would be more down to having a relatively isolated and small group of people living and working in close proximity. Dark triad individuals can be identified early and worked around or placed where they cannot harm. An explicit code of ethics would be an Achilles heel because any such a code can be hacked or subverted.

> They didn't have the endless power hungry narcissists that are endemic to every human society.

Of course they did. Most of the Admirals were like that.