The other thing I've noticed since the 1980's is that family bonds among whites are much weaker, fewer whites are married or in a relationship, so extended families are shrinking. Extended families are important for the social order and helping other family members with problems. That's why mass shootings were so rare at that time.
Extended family members provided support network and helped raise kids. Now everyone is isolated, depressed and angry and far away from family in our hyper mobile society.
In the 70's and 80's families would always try to get together for holidays and other occasions and neighbors felt like part of your family. At least that's what I remember. Now "family" for most people is just their circle of friends.