Caspian isn't sure that he's good enough to be king which shows that he wants to be as good as he can be and will strive to be even better which shows Aslan that he will have the welfare of his subjects at heart and will, therefore, be a good king.

I think this is a point about leadership, if not kingship, which can be found throughout the Narnia series. ....When King Lune makes his observations about leadership it is in full knowledge that if he is a good king he will be remembered well, but if he is a bad king he will invite disaffection and rebellion. Perhaps Caspian is also aware of this. Didn't Dumbledore also say something about this?

Miraz merely continues the Telmarine policy of marginalizing the Old Narnians, denying their existence, let alone their needs, and when he finds out they oppose him, he tries to destroy them. Though he also oppresses those who supported his older brother, Caspian the Ninth, in what ways does he also enslave his people?

Judging by that journey Lucy and Susan undertook with Aslan, there were several examples of people being enslaved, such as the schoolteacher having to teach unpleasantly behaving students or the schoolgirl forced to learn an untrue history. There was the bridge at Beruna, constricting a free-flowing stream, instead of a ford already supplied for people to cross. People were stopped by fear from going into the forests, and fear also stopped the Telmarines from exploring the ocean.[emphasis mine, wam] This is strange. Didn't Aslan also tell the Telmarines that they were the descendants of pirates, that is to say, outlaw seafarers?