We don't live in different countries. I was merely alluding to what sugar the average person adds to drinks like coffee themselves and it wouldn't be so much that regular sugar would be that hurtful, certainly not as hurtful as something like nutrasweet or sweet&low. There's also the more healthy substitute of raw honey. The fact is most sugar average people use already comes in the drinks and foods they buy. This means they're not really giving much thought to what sweetener is in those drinks, just choosing the drinks that offer zero calories. Many people have become much more aware of the fact how bad artificial sweeteners are though, no doubt the reason bottled water has become so popular and more water is sold now than those sodas and zero calorie drinks.
The reason I think you chose bodybuilding is because you know mostly all the steroid using freaks in bodybuilding support the use of artificial sweeteners and disregard all those studies that show the harm these toxins cause. You also have to realize that with all the heavy working out they do, they have much more use for carbs than the average population so, yes, it's more likely sugar is fed to their muscles than stored as fat. And, as you mention, they are also manipulating insulin levels. They don't do that just to add weight either. After a workout, your muscles are tired and depleted of energy. By increasing the blood sugar levels, it sends excess sugar into your muscles, and since your muscles need it, no excess sugar is stored as fat. You'd want to do this post workout and also in the morning when waking up as the muscle glycogen stores will be depleted. An insulin spike also helps transport the creatine effectively to the muscles without bloating. Surely you can see how none of this has anything to do with the general public.
What artificial sweeteners do among the average peeps is fake out the body and confuse the brain. The aftermath is the body calls for and makes too much sugar after the fake out and thus stores it as fat as most people, outside of bodybuilding, don't have the huge muscles that need all that energy nor are they taking it to the extreme in the gym hours on end every day. And, as I mentioned before, artificial sweeteners upset the bacteria makeup and balance in the gut by enhancing the populations of gut bacteria that are more efficient at pulling energy from our food. While that leads to fat being stored in average people, the excess energy being pulled from a bodybuilders food is more likely to be stored in their glycogen starving muscles than as fat.