Yeah, I really believe parents can have children who go really bad, and have no relationship at all to anything the parent did.
I had really good friends with a 13 year old son who killed the 13 and 6 year old girls who lived next door with a butcher knife.
They were if possible even more devastated than the neighbors whose children were murdered.
And, no, I don’t think they carried some sort of implied guilt for their son’s action.
Though many treated them as if they did or should.
Sorry, but you have NO idea of what goes on behind closed doors in a family. The parents did something not right.