their was even a next generation episode with wesley crusher and indians living on another planet being killed and run off by cardassians and wesley wanted to help them, and picards ancestors on old earth had something to do with what happened to them.
add to that elements of the search for the fountain of youth, an eden like or heaven like paradise, a bit too much like the planet in shatner's ashes of eden. that would have made a better trek 7 than generations.