Tell me again why we should reduce our sugar intake?

I am not a big sugar consumer-since a fairly intensive elimination diet to get to the source of my allergies, I'm finding I am consuming less and less sugar in my diet. Sugar is often a roadblock to our success with weight loss, has no nutritional value and as a nutritionist told me (and I'm sure you all heard this before) "Darlene, that stuff is pure poison."

So, why do we insist on ingesting this stuff? Here are reasons why we should not (condensed from an online article):

1. Sugar is seen by the body as an invader.
2. Mineral Depletion. When you eat refined sugar, your body takes nutrients from other cells to metabolize it because the sugar lacks the ability to do so on it's own. Minerals like calcium, magnesium, sodium and potassium are taken from vital body parts to make use of the sugar you ingested. Over Time, the vital body processes requiring those minerals run down and become less efficient.
3. Bone Loss. Your body particularly misses calcium as it is destroyed in your body's fight against sugar. With a decreased amount of calcium being used toward vital body processes, bones become weak, increasing the chances of osteoporosis, breaks and fractures later in life. Calcium loss also leads to tooth decay, a major component of the $50 billion dentistry industry worldwide.
4. Diabetes. Large sugar intake leads to the onset of diabetes because sugar raises your body's blood sugar levels quickly, causing the pancreas to release insulin. The constant consumption of sugar throughout the day forces the body to constantly work. Eventually, the pancreas wears out and cannot perform its normal duties.
5. Low Energy. Sugar consumption will leave you feeling run down. Eating sugar after a craving might give you the notorious "sugar high," but it does not last long. Soon you crash and feel more tired than you did before the high, have less energy and are hungrier.

So tell me again, why should we reduce our sugar intake?