It is not a war crime to defend a nation's civilians under direct threat by then targeting those rocket launchers. Those using human shields are the war criminals, and yet I never see you condemning them.
As to Obama...
Nearly 90 Percent Of People Killed In Recent Drone Strikes Were Not The Target
http://www.huffingtonpost.com/entry/civilian-deaths-drone-strikes_us_561fafe2e4b028dd7ea6c4ff
If that's not a war crime, then what Livni did to defend Israel is not a war crime either.
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ETA:
Finally, any rocket launchers aimed and fired at Israel pose a threat to Israel's civilians. Iron Dome isn't 100% fullproof. It is the fault of Hamas, Hezbollah by deliberately placing those launchers within civilian strongholds. The fact that Israel's civilian to combatant kill ratio is better than any other western nation goes to show how UNLIKELY it is that Israel committed war crimes, given what they were up against. Note that no other western nations since WW2 has had its own civilian population targeted and hit by rockets or missiles. If they did, their civilian to combatant kill ratio would be far higher than it has been, which is still way worse than Israel. Israel's better numbers WRT civilians proves that Israel is more careful than any other western nations. It's clear they're going after combatants, not civilians.
Meanwhile, pretending Israel is worse and that only its leaders are war criminals is vile.