I feel like your being too bias against Daemon if he’d actually managed to secure his position as King Consort. There’s no evidence that he engaged in some massive criminal operation, his tenure as Captain of the Gold cloaks saw a reduction in crime and greater efficiency from the watch. Just because he might have been personally corrupt doesn’t mean he wouldn’t have been an effective policy maker, look at Emperor Justinian’s advisors John the Capadocian and Tribonian.

Like fun there’s no evidence. WOIAF, p. 67:

“Prince Daemon improved the armaments and training of the watch and gave them the golden cloaks that led them to be known as the “gold cloaks” to this day. He often joined his men in patrolling the city, swiftly becoming known to both the meanest urchin and the wealthiest tradesman, and earned a certain dark reputation in the stews and brothels where he was wont to make free of the wares on offer. Crime fell sharply, though some said it was because Daemon delighted in meting out harsh punishments. Yet those who benefited from his rule loved him well, and Daemon soon became known as “Lord Flea Bottom.” Later still, after Viserys refused him the title of Prince of Dragonstone, he came to be called “the Prince of the City.” It was in the brothels of the city that he found a favorite, a paramour—a very pale Lysene dancer named Mysaria, whose looks and reputation led the prostitutes who knew her to call her Misery, the White Worm. Later, she became Daemon’s mistress of whisperers.”

WOIAF, p. 74:

The words Prince Daemon sent to Dragonstone after having learned the news of Lucerys’s death were, “An eye for an eye, a son for a son. Lucerys shall be avenged.” He was the Prince of the City, and he still had many friends in the stews and brothels of King’s Landing. Chief of them was his once-paramour, Mysaria, the White Worm. She arranged his vengeance, hiring a brute and a rat-catcher known to history as Blood and Cheese. Thanks to his profession, the rat-catcher knew all the secrets of Maegor’s tunnels. Slipping into the Red Keep, Blood and Cheese seized hold of Queen Helaena and her children…and then offered Aegon II’s wife a brutal choice: which of her sons would die? She wept and pled and offered her own life to no avail. In the end, she named Maelor—the youngest, and deemed too young to understand. Blood and Cheese killed Prince Jaehaerys instead, as his mother screamed her horror. Then Blood and Cheese fled with the prince’s head; true to their word that they were only after one of Aegon’s sons.

They don’t call you Lord of Flea Bottom and Prince of the City for no reason. Daemon turned the goldcloaks into his personal protection racket, organizing the crime in the city (which is why crime went down), and it was that network that allowed him to murder children and orchestrate the betrayal of the Gold Cloaks. And that’s when he wasn’t getting bored and starting wars to make himself king or having people assassinated to free up marriages he wanted.

Daemon was effective, but not for good ends.