IIRC a hamas leader in a wheel chair was taken out last year in a precision missle strike. He and his body guards were the only ones killed. How this compares to blowing up busses of school children I'll never know. In addition Israel isnt launching random rockets into palistinian territory.
You also have cases like that of Iman al-Hamas (That's her surname, nothing to do with the terrorist orginisation of the same name).
She was a 13 year old schoolgirl who got too close to an Israeli military checkpoint late last year. The soldiers shot at her, she ran away, one of the soldiers was giving a running commentary on the surveillance tape, which was leaked to the Israeli press.
The conversation between the company commander (Captain R), the watchtower on the scene, and the operations room:
Watchtower: "It's a little girl. She's running defensively eastward."
Operations room: "Are we talking about a girl under the age of 10?"
Watchtower: "A girl of about 10, she's behind the embankment, scared to death."
Watchtower: "I think that one of the positions took her out."
Captain R: "I and another soldier ... are going in a little nearer, forward, to confirm the kill ... Receive a situation report. We fired and killed her ... I also confirmed the kill. Over."
Captain R.: "This is commander. Anything that's mobile, that moves in the zone, even if it's a three-year-old, needs to be killed. Over."
Note that she was shot for getting too close to an Israeli security post. There was an unmarked "kill zone" around the post, which the girl wandered into. She had not crossed any barrier such as a fence.
The Israeli army launched an investigation after the shooting, and claimed that the girl had been sent by terrorists to lure troops out of the bunker so they could be shot at. They concluded the killing was justified.
2 or 3 of the soldiers involved, who had an ongoing disciplinary dispute with their commander (Captain R), went to the press and told the actual story, which included the commander walking out of the bunker, standing over the girl, and shooting her several times at point blank range.
The IDF then launched a second inquiry, and have charged "Captain R" with illegal use of a weapon, conduct unbecoming an officer, violating rules of engagement and obstruction of justice.
He hasn't been charged with actually shooting girl, even though he has admitted doing so.
In the last 4 years, the Israeli army (and air force) has killed 204 children under the age of 13, and over 600 under the age of 18.