How can Israel cut off electricity in Gaza?

No matter how you feel about this issue, we must call a spade a spade. Right now, Israel has cut off electricity, water and food supplies to the people of Gaza. In desperation, they bombed an apartheid wall created to block them in on all sides. They had no other choice, just as the people of New Orleans had no other choice but to break into stores just to get water and supplies for survival. Raw sewage is in the streets of Gaza, power generators are keeping vital equipment running in hospitals. I urge God fearing Christians who believe in the teachings of Jesus Christ to not be silent or bigoted about this matter. You might believe that the land belongs to the Jews, however if you are a true Christian or practicing Jew, you can't possibly ignore the humanitarian crisis at hand. For the sake of the God of the prophets in the Torah, Bible and Quran, I urge you to write to your Congressman and tell them to be fair and just, by demanding Israel to restore vial resources 2 the land