actually, something like this has happened before near where i live....

in the mid-90's, a club in Forest Park (which is a small community/city near Cincinnati) was subject to a mysterious individual who was poking people with needles, infecting them with HIV.....it went on for months......

i don't remember if they ever caught the person, but the club lost business and eventually had to close....

so yeah, there are sick fucks out there who do shit like this......