For starters, as you said, it is not just America doing this. So to point fingers at one country isn't exactly fair. 2nd, I've seen a few videos (Mainly here in California/LA since we're in a drought) use milk or another liquid. 3rd, the argument you use, while in theory is true, is finding something wrong in something good. No matter what someone does, there will always be someone to find the negative, or what is wrong with it. Sad to say, but it is human nature.
By your logic though, I would turn it around on you for making this point. Are you sending water to Africa? Are you conserving water by only taking a shower once a week or so? Are you making sure to eat all your food, instead of throwing it away? Are you sending food to Africa, or to nations whom need food for shelters?
The point is, yes - We all can do more to raise awareness for everyone/everything wrong in the world. Our daily activities, if we really dug into it, would make others shake their heads. It is a fact of life sad to say. But to turn something positive into something negative isn't fair, unless you yourself are doing exactly what you are calling everyone out for - Actually sending water or food to those who need it. If you aren't, then it is being somewhat hypocritical to call others out for doing something that is a positive.