This extract from a recent BBC article suggests it's far from indiscriminate, Free Will.
'Willing to sacrifice' Israel says more that 240 rockets have been fired from the Gaza since Friday Back at the bomb site, I met the man who owned the pile of rubble that was - until last night - his home.
Amazingly no-one was killed in the explosion, despite the complete devastation.
On first inspection it looked like one of Israel's missiles must have gone astray, a case of collateral damage.
But on closer questioning the pictures changes.
"I have already lost one son to the struggle for liberation," the man told me. "I have two more, and I am willing to sacrifice them too."
One of his sons is in the al-Qasam brigades, he says, the other in Islamic Jihad.
"After the attack last night (Sunday) the Israeli Shin Bet (Internal Security) called me on the phone to tell me it was because of my son's activities," he says.
I asked another local how it was that so many people could have escaped relatively unscathed from a building that was so completely destroyed.
"Sometimes the Israelis call up the person beforehand and warn them that they have 10 minutes to leave the house, then they strike."
