They can pass on resistance to the antibiotics without inheriting it. Pnemococci bacteria were found to devour random strings of DNA and cause mutations. This results in super bugs in high concentrations in locations where antibiotics and bacteria are found, mainly in the very sick people in hospitals. Workers in hospitals carry strep to the hospital. Intensive care units harbor super bugs that are not destroyed by germicidal cleaning.
Personnel go outside to smoke and return with outdoor bacteria.
All we have to do is wipe out the enemy and we will be cleaned. Kids in day care centers are given antibiotic creams for cuts and bruises that result in super bugs. Patients visit the doctor with a cold and insist on an antibiotic to get well fast. Doctors comply rather than discuss the matter. Besides, it could become a malpractice issue if the patient later got pneumonia.