breast masses

I am just flabbergasted why doctors subject women who have breast masses to needle biopsy? If I am the patient and the needle biopsy will turn out to be benign, I would not allow the lump to stay inside and wait for it to become malignant. There is a chance for it to turn malignant in the following years. We cannot know. Needle biopsy samples only a portion of the lump and not the entire mound. I would rather go for excisional biopsy to remove the whole thing and forget about it if turns out to be benign.
I opt for needle biopsy if I suspect malignancy and the breast mass is too big for excisional biopsy under local anesthesia.