Anand Giridharadas Jeffrey Epstein’s associates insisted they were ignorant. An extraordinary email suggests a more complicated — and troubling — reality. For friends and associates and collaborators of Jeffrey Epstein, the go-to plea has been the “slice of life” defense: “I knew him only as the Wall Street Guy, not the Rape Island Guy. I knew him only as a party boor, not a child trafficker. I knew him only as a donor, not a convicted pedophile…” In some cases, the Epstein files undercut this defense. Larry Summers, the former Treasury secretary and Harvard…