It is not up to them to define the ethnicity of Israel. For them to recognise Israel as jewish would amount to abandoning the right of return, the same right jews proclame for themselves. It would mean accepting "apartheid" and giving Israel the power to deport or ethnicaly cleanse palestinians. Why would any sane person commit suicide for the pleasure of someone stealing his land?
IDF reservist, 44, dies of heart attack during training (Haaretz)
from the article: Open letter to Mahmoud Abbas for Yom Kippur