ryuan
From Zero to Hero!
And those types could very easily just straight up go walk into his kingdom and murder him without bothering with collecting any "reward", or set up a cult, or start the zombiapocalyse, etc.He does not just object to it morally, he thinks it's pragmatically stupid. Power does not guarantee good will. A fiend could kill that dragon, a malicious sentient undead etc...
Remember, he already killed the dragon the kingdom couldn't deal with in the first place, otherwise the whole point would be gone.
EDIT: Hell, it don't need to be a princess, it could be a prince too. In the outer planes it should be more common for females to have higher levels since forever, and yet the point would still stand.
If it comes to a point where the ruler wants to welcome someone into the royal family on the premise he or she is the biggest badass on the region that killed the monster a whole kingdom could do nothing about, maybe the ruler in question had better motives than "because she's an asshole."
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