I'd argue that the propaganda is what children learn about him in government schools - the widely-believed idea that he was an evil "Robber baron" who should be hated.
I think what his heirs did with his estate after he passed away is a legit criticism, but is it his fault that the fortune was used for evil purposes? I don't think so.
That's why I put the disclaimer at the end saying: This post was solely written so you can see John Davison Rockefeller in a different light. It is by no means a defense of what his heirs and benefactors have done with his fortune since he passed away.