Yeah, there are quite a few villains in this show that are extremely evil. As you say, Lex is probably at the top of the list after #AllyCat. He may actually be one of the MORE evil incarnations of Luthor. Multiple versions of Luthor dress his villainy up with a fig leaf of humanitarianism. He wants to rule the world so he can save it, he wants humanity to realize how great it could be with him in charge. But DCSHG Lex basically just seems to view other humans as disposable. He wants to rule, period, and if other people have to suffer and die as a result, so be it.