Of blood
There are twelve known uses of dragon blood. Only one use for his, to be superior in everyway. Receive top grades, excel in politics, be aristocratic, look down on the plebian masses with their tainted blood or misplaced loyalties. This is what the world would see; that is all he would allow the world to see. Ignore the fact that his blood has aligned itself with a madman bent on destruction. Ignore the deaths and the torture of people whose only crime is the status of their blood. Ignore the cruelties that turn his stomach for the 'greater good' of wizarding-kind as according to his father.
The pureblooded heir, the entitled prince, the world by right is his to manipulate. Being born to privilege comes with certain responsibility. His responsibility, grow-up, marry a cousin, produce inbred…pardon…pureblooded heirs. Destroy opposition, any challenge to the cleansing of wizard blood. That is the life he was condemned to. Wizards are superior to muggles keep repeating it until it is true. So that when he stands before Voldemort to receive his mark at his father's side he can survive the shame of his pure blood.