Could be because of the records they kept. Thats what threw me for a loop about the Sackler lawsuits. There were emails with exchanges like (paraphrasing):

"Hey... this is gonna kill a metric fuckload of people annually..."

"Yeah, and? You want to make quarterly goal or not?"

Like even putting the dripping lack of morality and ethics asode, who the fuck is dumb enough to commit that shit to writing?