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A turning point in Star Wars history is Anakin Skywalker's development from a noble Jedi Knight into the terrible Sith Lord Darth Vader. The shift in the color of his lightsaber from blue to red is among the most arresting visual depictions of this change. Although it's tempting to believe this change would occur instantly, Anakin's lightsaber did not turn red right away upon becoming a Sith for a compelling reason.
User alignment or emotions have no bearing on a Lightsaber's color. Actually, it relates to the Kyber crystal found in the lightsaber. These unusual and strong crystals speak to the Force. A Jedi or Sith creating a lightsaber must select a Kyber crystal that fits their internal energy and Force capacity. The lightsaber's distinct color comes from this link.
A Jedi creates a Lightsaber through a process sometimes referred to as "bleeding the crystal." This entails aligning the crystal with their own light side energies by means of Force, so purifying it. When a Sith creates a lightsaber, though, they are effectively "forcing" the Kyber Crystal to align with their dark side energies. Referred to as "bleeding the crystal red," this process entails a far more strong and violent interaction with the crystal. The red lightsaber that results represents the Sith's link to the dark side.
Anakin Skywalker's path to the Dark Side was a slow one shaped by a lot of variables. Driven by fear, power tempted him; finally, anger and rage consumed him. It was a slow descent spanning years, not a quick change.
Anakin's lightsaber's metamorphosis offers a potent allegory for his own inner conflict and final descent. The blue lightsaber stands in for his first allegiance to the light side and Jedi values. But the dark side progressively corrupts his Kyber crystal as he explores deeper into darkness. This corruption shows up as the change in the color of his lightsaber, which ends in the brilliant red blade of Darth Vader.
Anakin's lightsaber's color ties to the alignment of the Kyber crystal with the Force, thus it did not turn red right away upon becoming a Sith. Anakin's trip to the dark side was slow, and the hue of his lightsaber matched his slow slide. Anakin's narrative gains depth and significance from the symbolic aspect of this change, so highlighting the great influence the Force has on both Jedi and Sith equally.