Dragons generally like going hands in hands with blunders and provokated errors ~
Túrin probably also should have tried to rescue Finduilas instead of searching for his sister... would have avoided loads of problems... stupid curse of Morgoth 🙁
Lord Túrin, son of Húrin, Why did you return?
"She looked to find her son there awaiting here. But if you are he, then I fear that all has gone awry."
Then Túrin laughed bitterly. "Awry, Awry?", he cried. "Yes, ever awry, as crooked as Morgoth!" And suddenly a black wrath shook him; for his eyes were opened, and the spell of Glaurung loosed its last threads, and he knew the lies with which he had been cheated. "Have I been cozened, that I might come and die here dishonoured, who might at least have ended valiantly before the doors of Nargothrond?" And out of the night about the hall it seemed to him that he heard the cries of Finduilas.
The general reason for blunders is pride --- playing a role in nearly all tragic stories, be it the unwillingness to give up something or just the arrogance not to see the own mistakes
Therefore the voice of Húrin, or the memory of his voice, was denied, and the first strand of the fate of Túrin was woven.
... same goes for selfishness
Whom shall we serve, if not ourselves? Whom shall we love, when all hate us?