Doctor Benjamin Spock started it in the 50's with the theory that discipline was bad for kids.
Then when the kids that grew up with parents that lived by Spock grew up. They KNEW that any kind of Dicipline DESTROYED their little shits psychologically and demanded/passed laws making any type of Dicipline = Child Abuse.
After all look at how well they did!! And now their kids are so much better than those of less liberated parents!!! You know, those animals that keep Abusing (correcting) their children rather than letting them run FREE!!