Why was tearing down the Berlin wall so important?

Answer 1

It was the symbolic end of the Cold War. Since the Cold War was a political and social state of being and no declarations were ever declared no peace treaty could end it. The tearing down of the wall also helped physically to reunite Germany and ended much of the vestiges of WWII.

Answer 2

It was the first step to reunifying East and West Germany for the first time since World War II. On a global view, it was a symbol of the Cold War between the United States and the Soviet Union ending.

Answer 3

Huge amounts of hazardous dust in the vicinity of the Wall, because communist concrete has asbestos in it.

Your order of occurrence is a bit off. They opened the borders and allowed East Germans to travel freely to West Berlin first, and then tore down the Wall.

Answer 4

The reuniting of Germany.