Great research you did! We have to be very careful of what kind of antibiotics we use and how much of it. As you pointed out, even low doses are enough to cause an antibiotic resistance. It is also important to keep in mind that only in extreme cases we actually need antibiotics. In a normal, healthy human being the immune system is capable of killing the infection on its own. Nevertheless, many people tend to take antibiotics to become healthy sooner without considering potential side-effects.