Israeli military authorities say that their strikes are targeted and that they are only bombing militants who belong to Hamas. Even if you believe that’s what the army is really trying to do, the population density [Editor's note: Gaza has the highest in the world with more than 4,000 residents/km²] means that it is impossible to avoid civilian casualties during these operations, especially when they take place close to refugee camps that are already overpopulated. Moreover, the leaders of Hamas and the al-Qassam brigades are not at home during the air raids. In the best case scenario, their houses are empty. In the worst case scenario, their wives and children are at home. In each case, it’s civilians, not militants, who are killed.
The Israeli army also says that it warns residents before launching a missile at a target. Ok, sometimes they do send out a warning missile before bombing a house or an apartment building but they don’t do it systematically and they give residents less than 15 seconds to hide themselves. Where can you go in such a small amount of time? When they do manage to get out, people stay outside, keeping to the sides of the streets. They wait for the end of the bombardment to go back home, to help their friends and family or, at the very least, to try and save a few possessions.