This is a fun article to read on this topic:
http://www.motherjones.com/politics/201 ... ris-mooneyIt explores the science behind why we don't believe in science.
Chlorine Dioxide is just a mildly acidic water disinfectant. It's used to kill bacteria in water but it sure as heck isn't going to clear up your asthma. To my understanding there is no cure for asthma.
People prefer to believe people who sound confident and those who act as if they have all of the answers. Modern medical scientists and scientists explicitly state that they do not have all of the answers and are always looking for solutions and testing existing theories. This means that, to the average individual, a snake oil salesman sounds more trustworthy than a scientist or doctor. We've come to misunderstand science, medicine, and generally complicated things often due to fundamental flaws in our learning as children and during our education. To anyone denying this, just think of the growing movement against vaccination across the bible belt in the US, the fear of food with chemicals in it all across the US, the desperate need to eat gluten free food in yuppy populations, and the idea that bottled water is any cleaner or superior to tap water. These movements aren't based in science or rational thought yet people cling to them desperately often due to cults of personality, fear mongering, or highly effective advertisement.
Now that that's out of the way, I'm not sure why you linked to an autism video? It's a bit of a non sequitur.