Building in the West Bank

Why, why, why does Israel continue to expand settlements in the West Bank? Why? The Israel government declares those settlements as "illegal," but they don't do anything else about it. Yet, when it comes to Palestinian development, Israel refuses to cooperate. Looking at the statistics in this BBC article proves just that. If Israel really condemned the settlements, they'd evict the residents. It's as simple as that. If it were Palestinian settlers, Israel would have forced them out. If they were really pushing for peace and come to some sort of deal with Palestine, then the least they could do is respect the borders of the occupied lands, no? Don't settle on land that doesn't belong to you.