God told Nehemiah to build a wall. The Bible is filled with walls for protection. Jericho had a wall which made them totally protected. Only God could destroy it. The rich have walls to protect them and their wealth. Prisons have walls around them to protect citizens from the prisoners. Israel built a wall to protect the people from the terrorists. Walls allow us to enjoy animals at the zoo as well as keep dogs behind fences etc. If you don't believe in walls then unlock the doors for your houses and cars and put a sign up saying all are welcome to come in. Obviously walls work and only the most stupid person would argue otherwise!!!