"I'm not going to [some basic thing like covering your mouth when you sneeze, washing your hands after using the bathroom, get vaccinated, take all my antibiotics as prescribed] because I'm healthy and that 0.01% risk doesn't bother me!"
Okay, but here's the thing: you live in a society. And society always has someone else - person carrying a high-risk pregnancy, person going through chemotherapy, person with AIDS, elderly person whose immune system is doing devil-knows-what at this point - for whom that IS too much of a risk. You want to be the one who got them sick with the disease that killed them?