There is definitely an association with skin pigmentation and skin cancer (and rickets the opposite way). But skin pigmentation is not why colonists are bad, the colonialism is. There are dark skinned Israelis and light skinned Palestinians (and Lebanese and other middle eastern minority national groups).

There are also places in the low latitude Southern Hemisphere (Parts of Africa, South America, New Zealand, Australia) and high latitude North America (Canada, border US states) that are perfect for white colonists "genetically", they still shouldn't be there.

Finally while middle eastern and South Asian people may have a lower pre-disposition to skin cancer, they still get skin cancer, but material factors like the clothing they wear and the hours of the day they work affects this too. An Israeli doing a 9-5 going in and out of AC controlled buildings in a t-shirt and shorts is going to burn more than a Palestinian wearing a headscarf, and long sleeves and pants, taking a break to rest inside a traditional house at the middle of the day when it's hottest and the UV is worse.

(also I imagine skin cancer is also under treated in Palestinians due to significant shortages in all medical care)