When asked foreigners captured whilst fighting for the taliban always to a man cite that they were radicalised because of Israel's occupation of Palestine. The solving of the Israeli/Palestinian conflict will end this radicalisation process and deprive Al Qaeda of recruits. That is why there will be a two state solution.
Hungary's Orban: Refugees threaten Europe's Christian roots (Reuters)
from the article: America's Mideast woes don't begin and end with Israel