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The examples you have given are true. In "certain" cases normal flora (good) germs do compete for resources and help resist colonization by pathogens (bad germs). If it were not for normal flora, humans would potentially not have a chance against bad germs. We would all be dead. There is also some cross immunization between good and bad germs. Your example of Lactobacillus and yeast is also correct but how do we get rid of the yeast infection? We treat with an antifungal agent.
However, the statement that good bacteria do not protect humans from bad is not "patently" untrue. If it were "patently" untrue then communicable infectious disease would not exist. The facts are humans are susceptible to infectious diseases despite all the good germs in the world. Humans are constantly fighting a battle against infectious diseases. We need all the help we can get. Preventing infectious disease plays a big part in this battle. One way to prevent infectious disease is to kill the microorganism causing the disease before it infects a person or is transmitted to another person. Hand antiseptics and sanitizers kill germs on your hands and reduce the number germs on the hands to decrease the probability of infecting yourself or transmitting the bad germ to some one else.