The U.S. has not been able to level the playing field and the rest of the international community is too self-interested to intervene. Israel is unchallenged in the Territories and can continue to expropriate land and resources at will. To top it off, the PA serves Israel's interest in a number of ways, especially regarding security and by assuming the responsibility for the civilian population which would otherwise fall to Israel. The status quo for Israel is nearly too good to be true. Why would they change it if they didn't have to?
Magnitude 6.1 quake hits Panama-Colombia border (Reuters)
from the article: To powerfully lead