I had a friend at uni whi was studying microbiology. microbiology
If he got a sore throat, cold, general non specific illness he would up and off to the dr’s “for antibiotics”.
The first time he did this i was fairly stunned and said you do know it’s likely a virus? Yep, he understood. And you do know antibiotics don’t work on viruses? Yep, he understood, after all he was a microbiologist.
So why are you wasting yours and the dr’s time getting antibiotics, not to mention the resistance problem, which surely you are informed about, what with being a microbiologist?
“They make me feel better”. I did point out it was likely not the antibiotics but his body naturally fighting the virus off, but he had taken ab’s for every sniffle for so long, and every time had got better a few days after starting the tablets, that he was utterly convinced they helped. Plus he’d never become resistant 
That and of course when he felt better he stopped taking them. He’d save the leftovers for next time so he could get started before going to the gp.
This is an intelligent bloke, educated in the field. But even a degree in bacteria couldn’t change his lifelong conviction that antibiotics worked whenever he was ill.
You can probably multiply that level of ignorance about antibiotics x100000 in the general population.