Now who exactly is Barret Wallace? Here is what wikipedia has to say about him...

Barret Wallace is a playable character in Final Fantasy VII. He is the leader of an eco-terrorist group AVALANCHE, trying to prevent Shinra Electric Power Company from using Mako, the planet of Gaia's life source, as a form of energy. His seemingly benevolent cause of fighting for the Planet is a cover for his personal vendetta and anger, which he later must come to terms with. Despite his brash and sometimes violent attitude, Barret has a good heart, and is torn between fighting and caring for his daughter Marlene.