Most janitorial jobsites have the risk of having a bloodborne pathogen on their premises at some point. Nobody wants to get aids that is not good! if the janitor or cleaning associate knows about the risks associated with blood and the pathogens in blood- they will reduce the risks of cross exposure or having really gross blood get on people. 

With the advent of pandemics and health authority guidelines we will only see the strong policies enacted where every single employee from office worker to dishwasher is at least on some level aware of how actually gross the bloodborne pathogens actually are ! (really gross) 

You can get a super weird liver or have to live in a hospital most of your life if you contaminate yourself with a bloodborne pathogens so having a knowledge of how to properly dispose of items that you suspect might be infected with this disgusting pathogen. 

Nobody wants a disease, and nobody wants to be sick... which is why it is essential that every employee in the cleaning profession treats the sight of a blood drop -not as a possible drop of fruit punch or cherry juice- but as a potential biohazard and a risk ! it's important to understand that by ignoring the drop of blood and wiping their eye after touching it could infect you with HIV !!