They are at fault for being suppliers? If they don't supply oil someone else will. Like blaming prostitutes instead of johns
But not that oil.
I think we have some moral standing to blame prostitutes for STDs. Peddling oil despite its externalities because people are addicted adds to the overall world market, driving down price, in turn hampering renewables.
They are contributing to fossil fuel usage. You don’t get to “but we also drive EVs!” your way out of that.
I would also suggest it’s more akin to blaming drug users instead of drug dealers, but whatever metaphor floats your boat.