Cynical is my middle name. You do know that Diogenes is the father of Cynicism? That Johnson was a Racist Southern Democrat who had the typical Democrat attitude regarding Blacks is not lost on me. I just don't think he anticipated that giving them government housing and welfare would result in the destruction of the black family which subsequently occurred.
In other words, I don't think Johnson was that smart. I think he could see the votes, but never thought about it much beyond that. Johnson was a good politician, but a brain surgeon he was not. Most Democrats had no idea what was going to happen. The sole exception was Daniel Patrick Moynihan, who looked into the situation and wrote a treatise about it. The rest of the Democrat party was just ignorant stupid power seekers, same as today.
Johnson absolutely understood that government dependency would facilitate permanent bondage. This has been a traditional ploy in the old south since reconstruction. It sold in the North as beneficence and it was understood in the South as a structural tenet of racism.