Safe?

I saw a headline recently, commenting on radiation therapy for thyroid cancer. The headline read "It kills thyroid cancer, but is it safe?"

Um, I think that's the wrong question. If it really kills thyroid cancer, then shouldn't we be asking "Is it safer than thyroid cancer?" I'm going to guess the answer to that one is yes.

Admittedly, I didn't read the actual article, so maybe they went into the whole "is it safer than other treatments" question... But the headline itself struck me as particularly absurd.