Hamas were observing the ceasefire agreed between June and October. Israel then broke by killing 6 Hamas people in Gaza the night Barak Obama was elected (thought the world would be pre-occupied). Then it launched Cast Lead in Dec 2008 which killed mostly civilians including over 300 children. It seems Israel and their fanatical supporters prefer the bloody solution.
Report: IDF find M-16 rifle hidden in Palestinian's car in West Bank (Haaretz)
from the article: Rocket-battered Sderot faces bankruptcy