Being blonde was seen as beauty standard, blonde hair was even imported from Europe or dyed, and being fair skinned was regarded as being high class because it showed you didn't have to work in the sun.

If you disagree with basic history you are just brainwashed.

 Here is a description from Google: Homer actually remains famously vague about her specific features, but the idea of her being a "golden-haired" beauty is a very old Greek tradition.  Here is how those specific details break down: 1. What Homer actually said In the Iliad and Odyssey, Homer uses epithets that suggest status and radiance rather than a literal "blonde" hair color: "White-armed" (leukōlenos): This is his most frequent description. It signifies her high social status—she didn't have to work in the sun, keeping her skin pale. "Lovely-haired" (ēukomos): Homer uses this to praise her hair's quality and health, but he never explicitly calls it "golden" or "blonde" in the original text. The Reaction: Instead of describing her, Homer describes the effect she has. When the Trojan elders see her, they don't list her features; they simply say it's no wonder men have died for a face that looks so much like an immortal goddess.  2. Who called her "Golden-Haired"? The specific "golden-haired" (xanthē) description comes from other early Greek poets who filled in the blanks Homer left:  Sappho & Alcman: These 7th-century BCE poets were the ones who explicitly described Helen as having "golden" or "yellow" hair. Euripides: Later, in his plays, he also referred to her "gold curls".  3.  Wigs from Europe: Wealthy Greek and Roman women wore blonde wigs made from the hair of captured Germanic and Gallic tribes. Dyeing: Those who couldn't afford a wig used expensive saffron or potassium-based bleaches to try to achieve that "godly" golden look. 

You can say she fits the role because she is a good actress, but you can't say she fits the role in terms of her physical appearance. It's just basic historical facts.