Lyndon Johnson must have had a deep hatred for black people.Just look what he did to them.
He might have hated them, but he had no problem with buying their votes.
The cynical view is often expressed thusly:
By keeping black families fatherless, the Dem "poverty" programs keep them poor and dependent.
By keeping them dependent, the blacks are in a way "owned" by the Dems, and will reliably vote for Dems to get a subsistence living disguised as free stuff.