The discontinuation of the building of Settlements is not even a "risk" to Israel's security but it would convince the world and the Palestinians and the other Arabs and Muslims that Israel is serious with regard to reaching a settlement based on the notion of lands for Peace. So why not do that? Unless that really isn't the idea or goal.
4 UN peacekeepers injured in Sinai and taken to hospital in south Israel (Haaretz)
from the article: Time for Israel to take risks for peace