They're terrorists who initiate conflict :3 When Israel is strong there is peace. When Israel is weak (or presumed as such) there is war. But I can understand your confusion, as you have the roles of the defender and the aggressor changed accidently.
5 tourists rescued from Hebron after being hit by firebomb; 2 hurt (Haaretz)
from the article: Israel intelligence official: Hamas rockets can reach Tel Aviv