thats true, and we do not know the reality or possibility of terraforming or colonising other planets. but i don't think this invalidates the analogy for the reasons oregon elephant expressed.

it is not a perfect analogy, no analogy is. but the situations are, i think, similar enough to draw parallels.

certainly, the political situation of the colonists is very similar to the new world colonies, and that was one of the initial points of this thread.