There are no cases in which Israel has targeted Palestinian civilians. There are three reasons Gaza death tolls are higher than Israeli death tolls.
First, despite the fact Hamas knows their actions will provoke and Israeli air attack, they build no bomb shelters to protect Palestinian civilians from being caught in the cross fire.
Second, the Gaza terrorists routinely use Palestinian civilians as human shields, often firing mortars and rockets from civilian areas to discourage the IDF from returning fire.
Third, the most powerful weapon in the Hamas arsenal is the high numbers of Palestinian civilians caught in the crossfire because of the two actions listed above.