Bull$#!+. If it had anything to do with being in the desert camels would have hair on their head and hump and nowhere else. Head hair evolved so baby humans could have something to hold on to while they were in the water with their mothers. Humans evolved fingers and thumbs so they could hold on to their mother’s hair. At least partly.
“Humans evolved long hair on their head to prevent overheating and excess water loss when walking under the hot sun in Africa”
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1 Corinthians 3:19
For the wisdom of this world is foolishness in God’s sight. As it is written: “He catches the wise in their craftiness”