Different diet plans suit different people. I have not done Atkins however I never really ate fruit so it isn't something I would have missed so maybe this plan suits others the same!
From what I have read it is only phase 1 that Atkins diet doesn't allow fruit, this is to keep your carbohydrates down as you are limited. Phase 2 of the Atkins diet introduces certain fruits to your diet that are low in carbohydrates.
Fruits can be packed with carbs, Atkins is a low carb diet slowly introducing more into the diet the closer you get to maintain.
*Answer only based on my understanding of the diet, I could be wrong.