Antibiotic's prevent bacterial cells from multiplying,Allowing the host to fight and control the amount of bacteria by using 2 line of defense also known as a process called phagocytes, but as a society and a group we use Antibiotics to much so much that most of time we don't even use it for life saving purposes.
The thoughtless person playing with penicillin treatment is morally responsible for the death of the man who succumbs to infection with the penicillin - resistant organism. I hope this evil can be averted.