The destruction of the arena is a turning point in the story, as it marks the beginning of the end for the Capitol. It shows that the people of Panem are no longer willing to live under the Capitol's rule, and that they are now prepared to fight for their freedom.
The symbolism of the arena's destruction is further emphasized by the fact that it takes place during a televised event. The entire nation of Panem is watching as Katniss and Peeta destroy the arena, and this sends a powerful message to the people of Panem that change is possible.
The destruction of the arena is also a symbol of hope for the people of Panem. It shows that even in the face of great oppression, the human spirit can still prevail. It is a reminder that even the smallest acts of rebellion can have a big impact, and that change is always possible.