Because it burns you. That's the answer. It kills your skin cells and eyes the same way it kills the bacteria. Also, it is everywhere, it's fucking outside. The sun. Fucking stupid. Idiots.
Know what else kills bacteria? Bleach. So get chugging.
At this point, it’s clear that in small-scale settings, far-UV can kill the vast majority of pathogens present, which in turn would vastly reduce the risk of respiratory disease spread. It seems safe for human skin, and likely safe for human eyes, too.
Luckily we are more thick skinned than a bacteria, who would have thought?