Why did the court rule in Gideon's favor?

The court ruled in Gideon's favor because it determined that the right to counsel is a fundamental right essential to a fair trial, as guaranteed by the Sixth Amendment. The Supreme Court found that states are required to provide legal representation to defendants who cannot afford an attorney, thereby extending the principles established in the earlier case of Miranda v. Arizona. This ruling reinforced the concept that the right to a fair trial is a cornerstone of the American justice system, ensuring that all individuals, regardless of financial status, have access to legal defense.