If fire cooks food, why isn't my steak grilled if I wave it over a candle?

If sound can damage eardrums, why am I not deafened by the pitter-patter of rain?

If alcohol kills germs, how can I get sick when I'm drunk?

There's an application of UV that will sterilize. That doesn't mean the simple existence of any kind of UV will fully sterilize all things.