Legacy gets one looked at. Its not an automatic admission.
Unlesss you are simply stating that legacy admissions should be disqualified (this would be ridiculous), then also consider that:
you may be making the "research" error of uncontrolled variables that include the fact that legacy kids are likely to be smart, their parents are astute enough to track them in a manner that makes them better candidates on average, and that their parents are more aware of the process that they can relate to the child.
Al leading to a statistically significant rate of legacy admissions that has nothing at all to do with unfairness.