Isreal and the West Bank

I saw a clip on the news the other day about Isreal "invading" the West Bank. This young girl in London was protesting the fact that Isreal was sending troops into the West Bank. She protested that school children were being killed in the West Bank, and questioned why did kids have to be killed. She evidently doesnt care about the rockets fired indiscriminately towards Isreal. What about those school kids? If you protest anything, it should be the rockets, not Isreal defending itself.