The problem is that once Israel allows construction materials to enter Gaza they end up as weapons. The concrete will not be used for the construction of homes and other infrastructure but for military installations. If Hamas truly cares about the people in Gaza then it would repudiate its call for the destruction of the state of Israel. And what about Gilad Shalit?? Are we supposed to reward Hamas who entered sovereign Israeli territory and captured him way before cast Lead was commenced? You are ignoring the relevant facts!
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Irish FM urges EU to pressure Israel to end Gaza blockade