Politically incorrect Q: If different racial charactistics evolved as response to different climates, why aren't Alaskan natives or oriental peoples from the north or indigineous peoples of Australia and South Africa as pale as northern Europeans?

The evolution from short kinky hair to long straight hair as people moved from the equator towards the poles makes sense. Short kinky hair would be better at cooling the head in warm climates, while long straight hair better at keeping the head warm [I think]. But coloration and maybe body hair does not seem to follow any consistent evolutionary purpose. Are the pale hairy peoples of northern Europe Darwinian flukes?