Just look at the ingredients on most breakfast cereals and you'll see sugar or some kind of sugar substitute as the second or third ingredient. Eat real food if you're at all interested in your health.
Why fear 50g of cereal when you eat it with 200+g of milk, which is about the most perfect food available?
Sugar is the preferred energy of almost every cell in our bodies; and in the end, protein & fat will be converted into glucose if no sugar (glycogen) is available.
And sugar is "easy energy" and will make you fat. There are better sugar types (such as fructose (sugar from fruit) and Dextrose (found in the pharmacy))
All non-fibre carbohydrates are metabolized as sugar, and it's VERY rare for our bodies to convert carbs into fat. All complex sugars are broken down into monosaccharides before absorption. Chew on a piece of bread for a couple minutes and enzymes in your saliva will break it down into glucose, and it will become sweet in your mouth.
Dextrose is glucose, and sugar does not directly make you fat. Eating a sustained caloric surplus makes you fat, no matter the macronutrient composition of your diet.
Here's more detail about the biochemistry of how we get fat - http://www.bodyrecomposition.com/fat-loss/how-we-get-fat.htm...
Not THAT rare. Add alcohol, or just eat a whole lot of carbs and few fats[0].
[0]-http://examine.com/faq/how-are-carbohydrates-converted-into-...
Through a similar mechanism to alcohol, one can start up DNL much faster with large acute fructose consumption, but even in that "worst case scenario" we still only convert about 1% of surplus fructose into fat - http://www.nutritionandmetabolism.com/content/9/1/89
Somewhat ironically, a scenario where we make more fat from the carbs & protein we eat is when we consume very little fat. Eat less than 10% fat in your diet and this will cause DNL to ramp up. This is explained more in the "how we get fat" link in my previous comment.
Your last point was the main gist of my post, though I didn't spell it out so well. I didn't realize that about fructose though.