I agree with you and the grandparent partly, but if you take an intersectional view of diversity issues, solving diversity and (as you put it) increasing inter-group empathy are effectively one in the same. For me, the constant rearing of this connection (societal scale problems being solved in tandem by solving other societal scale problems) is what convinces me that ideas of intersectionality are real, but sadly leads to the conclusion that yes, the problems are extremely difficult and operate on generational scales.