Yes, fat is good. But not by the ton, of course!
Atkins is often wrongly described as a 'high protein diet'. It is in fact a high fat, low carb, medium protein diet. We really need those fats to make our bodies burn our fat stores.
I know it sounds crazy to those of us (everyone? lol) used to traditional low calorie/low fat diet plans but Atkins is different. Low-carbing in general is different.
We have to just accept the wisdom of all who have gone before, and the science laid out in the books, and get on with it!