What points were ignored? 10 times as many border guards are required without a fence than with a fence. The fence makes guarding the border cheaper. All those against building a fence are actually against sealing the border. They support illegal immigration.
You aren't fooling anyone.
I am not really sure that it would stop the immigrants because of all of reasons previously mentioned ( bribing guards, tunneling, going around the fence, etc) , but it would sure make one hell of a turist attraction : the XXI century version of China's great wall.