The Great Wall of China was 13,000 miles long, 16 feet wide across, and 20 feet high built to keep out the Mongol tribes from invading the borders and raiding the towns and villages. So why did the wall fail? The Mongols went over and under the walls, gave bribes to border guards and officials to look the other way and in some cases intentionally weakened the walls at various points to allow the Mongols to break through. There was a General who after receiving a large bribe, opened up one of the main gates that allow the invaders to overthrow the Ming dynasty and form the Manchu Dynasty. Walls failed France allowing the Germans to successfully invade them twice. The “stable genius” is too stupid to realize that walls don’t work by themselves without it being supplemented by other technologies.