It shows clearly that the missiles have been fired from a residential area. According to the Fourth Geneva Convention, civilian areas from which attacks are staged lose their immunity. Therefore, if the IAF chooses to heavily bomb the residential area depicrted in order to stop the rocket fire, it is perfectly legal to do so under international law.
Helicopter carrying at least 14 crashes in western Norway (AP)
from the article: Gaza rocket explodes in northern Negev