I'll take responsibility for reading a correlation into the two halves of your response that wasn't there, but I still question the value of the whole post to this discussion. Whether we're talking about Chaotic Evil or chaotic evil. an analysis of different character motivations is neither nonsense nor irrelevant to the discussion of persistent successful "evil" campaign.
Put another way, it's fine if your pirate PCs didn't have alignments written on their character sheets, but I find it difficult to believe that means they did not behave in a manner consistent with a Chaotic or Evil (or chaotic or evil) alignment. I would have been far more interested to hear how their behaviors lent themselves to the success of the campaign than to hear about how you think half of alignment is nonsense and the other half is irrelevant.
For my part, this being a D&D discussion forum, I find it useful to discuss using D&D terminology. I don't do so to invite technical criticism.