Tel Aviv is the center of Israel's educated and cosmpolitan class. Because these people are the most informed and globally aware, they are the ones who see most clearly that Israel's policy in the West Bank is illegal, immoral and self-defeating. Since the army is ultimately responsible for carrying out that policy, it is entirely natural that these people would be least willing to serve in such an army.
Law expanding definition of terrorist activity passes first Knesset reading (Haaretz)
from the article: The draft-dodging state of Tel Aviv