If you think about it, it's true. At least, it is from his perspective. He's the legitimate heir of Zeon Deikun's legacy. House Zabi betrayed him, not the other way around. Axis is an attempted revival of the Zabi dictatorship, and just as guilty of that betrayal as the failed state they're trying to recreate.

So, really, Char is a great, trustworthy guy. From a certain point of view.