Banishing their upstart kids for trying to force the entire colony to live in a way they had abandoned was their prerogative
But it's okay for the elders to force the young adults to live a cerain way?
Don't parents always do that? Isn't that what parenting is?
. Making the upstarts get on a ship and leave
How'd they do that?
Not only forced them off the planet, the elders were able to beat the young adults in the rebellion.
As I said in my post (that you didn't quote), The Ba'ku knew the technology. Not their parents or grandparents or great-grandparents, them. The Ba'ku elders are the ones that first came to the Briar Patch, and therefore are the ones that knew the technology and how it worked. It was probably child's play for them to put a definitive end to the rebellion and banish the upstarts in the very ships they themselves wanted in the first place. I don't know about you, but it became rather plain to me that the elders' response to the rebellion was somewhere around "You want the ships? Take them. And don't come back."