I would suggest that the bare minimum requirement for "independence" is that you achieve a viable state that is not subservient to the whims of its much bigger neighbour. All the "peace offers" that they received would have left them subservient to the whim of Israel, and so they (rightly) rejected offers that could not give them what they need, which is true independence from Israel.
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France will not take in more than 30,000 refugees, prime minister say (DPA)
from the article: Erekat: Palestinian Authority cannot exist without independent state