If I'm remembering this case correctly, Donzinger's own expert paid by his side even concluded that the toxic waste they were trying to get Chevron to pay for had to have been dumped after Chevron's involvement had ended when the subsidiary was solely owned by the Ecuadorian government, he withheld that evidence from the court, and there were internal documents from the discovery process confirming this. It's just that people's preconceptions about evil oil companies screwing indigenous communities get in the way of thinking about whether it's actually true.