Perverts who like boys will hang around boy organizations. I don't think the BSA is unique in having this problem.
My sense is that in 2012, we have higher standards in this area for two reasons: first, because we CAN have them (computers, better records, better ability to monitor) and second, because we're more alert to the detrimental effects of molestation.
It used to be virtually laughed off, or treated as a small matter.
I have a tough time, though, using 2012 standards/science in order to condemn those using lousy science and technology and wrong psychology. You may be forgetting this, but at one time, experts thought this kind of perversion was treatable.