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I did have a whole philosophical rational worked out in answer to that, but I think I'll go with the simple two-word answer to what happened:

'Trek scriptwriters.

I was think that around 2320 there was a massive crack cocaine problem through out the Galaxy and the generation we see were all crack babies.

Please - I do tend to take insults based on my involuntary addiction somewhat personally.

No, I'm just kidding - my addiction to crack is purely voluntary.

Capt Kirk sired millions of babies across thousands of worlds and as they grew up begain cross breeding out of the ego built need to touch the seed of kirk. The galaxy then turned into its own form of West Virginia!