Don’t miss that the effect on athletes is quite a bit larger than the effect on legacies! See page 4.
Legacy admissions are indefensible, but athletic admissions are even less so. (Less than 0, I guess?)
No one outside of Harvard cares how their fencing team does and (I presume) 99% of current Harvard students don’t either.
If you want to find the group that is most unjustly benefitted by a dumb feature of the admissions process it’s in my view athletes.