No one is debating whether glucose is or isn't a building block for life, the problem is that humans have evolved from an existence that has of food scarcity but now lives in a world of food abundance.
Not only do we live in food abundance, commercial interests exploit our hardcoded desire to seek out energy rich food to make more profit from us usually by pumping sugar into everything.
This can be as innocent as competing for repeat business at your local restaurants or engineering your food to optimise for the bliss point[0] in order to subvert your natural satiety mechanisms and maximise the addictive quality of the product.
Sugar and its derivatives like HFCS are everywhere. Your sauces and condiments are swimming in it. Subway bread was so high in sugar it couldn't be legally called bread in the UK.
My own personal favourite anecdote was from someone senior in McDonalds:
"we find from our studies that children do not like a meaty beef flavour in their patties so we deliberately choose a bland patty mix while adding sugar to the buns and smothering the burger in ketchup because kids love sweet stuff, unlike our competitor Burger King. Once the habit is conditioned from young, they will be a customer for life"
Case in point, my wife loves the idea of McDonalds and admits every time that the reality is always disappointing but she is still drawn to it due to nostalgia.
Given that a lot of the developed world has obesity problems which puts a strain on public resources, it's really important to get a grip on our sugar consumption
glucose (C₆H₁₂O₆) + oxygen (6O₂) → carbon dioxide (6CO₂) + water (6H₂O) + energy (ATP).