If gonorrhea is a treatable infectionwhy do so many men experience severe damage and infertility or joint infections as a result of leaving it untreated

Gonorrhea is treatable, but that doesn't mean it treats itself. Just like cancer, pneumonia, etc., gonorrhea needs medicinal treatment and if that treatment never occurs the consequences can be devastating. 

Ibelieve it would be d (side effect) sorry if i'm wrong(:

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.