Why don't guys protect their nuts in basketball?

Just found out guys don't wear protective cups in basketball. Why on earth would you not protect your most fragile and most prized parts? A guy at my school took a blow to the groin and suffered testicular torsion (twisting of the spermatic cord) during his basketball game. A guy playing basketball in his PE class in the private school near me had to have surgery down there after someone accidentally stepped on his family jewels during a scrum beneath the net. Injuries happen and yet protective cups aren't worn in basketball? Why?
Why don't guys protect their nuts in basketball?
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