Two of my characters have technically already hit their breaking point at some point in the past - Gogonji's plot, in fact, was basically wrought entirely from his doing so. Returning home to show off his findings and prove he was right to his father, only to find the place razed and Garleans poking around for survivors did very little for his mental state. And, even after being defeated and learning that his family was - in fact - okay, he still maintains a lingering hatred of Garlemald for pulling what it did.
Chachan might have come close to the same, but he found out about the razing as the refugees arrived at Ul'dah... and the news was coupled with learning that his family made it out okay - which helped a lot. Considering his love of friends and family, I would figure seeking one of them fatally wounded or outright killed in front of him would be the breaking point. As for what he would do, I'm less certain since I hope such a situation never happens to him. My best guess would likely be Eorzea's Most Violent Temper Tantrum, with little Chachan going after the offending party with all the bundled up rage a little muscly popoto armed in the highest quality weapons and armor could manage.
Chachan might have come close to the same, but he found out about the razing as the refugees arrived at Ul'dah... and the news was coupled with learning that his family made it out okay - which helped a lot. Considering his love of friends and family, I would figure seeking one of them fatally wounded or outright killed in front of him would be the breaking point. As for what he would do, I'm less certain since I hope such a situation never happens to him. My best guess would likely be Eorzea's Most Violent Temper Tantrum, with little Chachan going after the offending party with all the bundled up rage a little muscly popoto armed in the highest quality weapons and armor could manage.