The sugar contents of some of the staples - bread, sauces, etc. - can be shockingly high. A tablespoon of ketchup has more sugar than a chocolate chip cookie.
Ketchup isn't really any less fresh than the butter/oil.
Ketchup has about 1/3 the calories of a chocolate chip cookie. What does it matter that it has the same amount of sugar?
http://www.kraftrecipes.com/products/kraft-16-fo-dressing-li...
Or even if you are making your own, a surprising number have sugar or honey as ingredients.
I was agreeing with your point.
As to your second paragraph, well, here is my point illustrated. Added sugars are probably our biggest problem. Even when it comes to lipids, I don't think most people cooking at home are making Cheesecake Factory-style meals. But my understanding of the latest research is that trying to remove fats from your diet is no longer necessarily recommended.
It's not the only way (Honestly, I prefer duck/goose fat if I'm feeling fancy, beef if not), but it's a perfectly acceptable way of making crispy delicious hash browns.
Probably with cheese sauce for good measure...
I have never used a full stick of butter in the making of either of these. For hash I use as little as I need to lubricate the potatoes. For mashed I use about 1 tablespoon per 2.5 pounds of potatoes. Since I have never made 20 pounds at once, I have never used a full stick.
Who actually adds a mind-boggling amount of sugar to their food when they cook from basic ingredients? Everyone I know overdoes fats, but sugar?