Ugaki was moron because -
he was in the position to teach his men, all young pilots of around twenty, to survive for themselves and the future of their nation as the war was over.
If he thought he had to die to take his responsibility for the Kamikaze tactics, he had other fair ways, like harakiri, to do so by himself.
To the worse, in case of 2nd Lt. Shoichi Ohta who invented and suggested the suicide attack by infamous 'Ohka' - a human flying bomb, he flew a trainer without permission three days later the war was over. He kept flying aimlessly on the Pacific. He would have been going to die and was regarded as MIA finally. Pension was paid to his family.
However, a researcher found him who was almost dying of cancer at a hospital in Kyoto fifty years later.
He had been rescued by a fisherman and survived the rest of his life with a false name.