Saturated fat is not harmful in the context of a low carb diet. This study from Johns Hopkins Medical School confirms this. The ketogenic diet plan is healthier because the higher saturated fat intake increases your HDL cholesterol, and at the same time, a lower carb intake decreases your triglycerides levels. These two factors are the major markers for heart disease, and the closer your triglyceride/HDL ratio is to 1, the healthier your heart. In reality, the cause of heart disease is a chronically high carbohydrate consumption, not a high saturated fat and cholesterol intake. I think the best way to learn this is to get a full blood test before you start a ketogenic diet plan, then do the diet faithfully for 3 months. Then have your blood work checked again. You'll see the difference and discover how much better you feel. 
A keto diet has shown to improve triglyceride levels and cholesterol levels most associated with arterial buildup. More specifically low-carb, high-fat diets show a dramatic increase in HDL and decrease in LDL particle concentration compared to low-fat diets.3A study in the long-term effects of a ketogenic diet shows a significant reduction in cholesterol levels, body weight, and blood glucose. Read more on keto and cholesterol >
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