I mean, the show just turned Ollie into a serial killer. It always crouched his killing in terms of justice, truth and making the city a better place. Sure, he had no qualms killing. But no matter how many bodies he dropped, he did it because people failed the city. The reveal completely did away with all that. The List is no longer a noble ideal that Ollie undertook to honor his father's dying wish. It's now the trophy of a serial murderer. Ollie probably spent his nights revisiting the thing, looking at the names crossed off and smiling like the psycho he was. Thank god Felicity,
saved Ollie from that darkness.