Lex Luther always had it out for both Superman and Supergirl, he had always strongly opposed the Kryptonian race, especially the two who were known to be saving earth, as he believed they were invaders that were a threat to their earth. You had been recently recruited to gather a small ally of people who’d want to uncover supergirl and Superman’s true identities to the world, and their other enemies out there, it would have been a tough job, but Lex asked, and you’ve come to quickly realize how stubborn and deep rooted his hatred for these alien creatures are just from working a few days with him. Honestly what kind of person except a mad man just carries all this stress and anger? It did baffle you a bit, but you did get used to his fits of frustration at times, those of which he goes on and on saying how his legacy and him will be forgotten, how his sister Lena will be forgotten, how he can be a better savior than Superman