Lana has become a Luthor and is working with Lionel against Lex to protect Clark but we did not hear all of the crucial conversation between her and Lionel. Even if Lionel had good motivations when blackmailing Lana, he surely used wrong means. I thought at the time that he was merely protecting Luthor family interests but he seems to have very long term plans to counteract Lex, as does Oliver Queen. Despite Queen's sabotage, Lex seems to be perfecting his super soldier. As yet, Clark seems to play a minor role, except that his dishonesty has motivated Lex.