1) Lex cares about the world.
-Lex proposes a plan for "global security"
-Lex spearheads the rebuilding of Metropolis with his "rebuild Metropolis crews"
-Lex donates money to the Metropolis Library and hosts a fundraiser
-”We don’t have to depend on the kindness of monsters”
-”Look at us. This is how it all caves in. Civilization on the wane, manners out the window.” This quote shows Lex’s concern for humanity and also indicates he feels he and Batman, both Men, should be fighting on the same side against other worldly tyrants. As Lex says at the fundraiser, “You should hop the harbor more often. Maybe I can show you my labs, partner on something.”
-Lex believes that Man can take down God. He gives Batman a fighting chance.
2) Lex cares about his image.
-Lex puts on a purely superficial presentation to the Senators upon their arrival at LexCorp
-Lex goes out of his way to act charming and witty during the fundraiser
-Lex eliminates anyone who can tarnish his name, specifically during the Capitol bombing.
-Acts humble about having his name on the marquis
-Lex stutters at the thought of the world thinking he’s insane.
-Although he doesn’t follow through, Lex makes it known that he is at the Senate to tell his story about being willing to finance a Kryptonian deterrent
-He’s arrogant to think he can’t lose (which happens to also be his weakness).
3) Lex cares about power.
-Lex: "And now God bends to my will."
-Lex: "I don't know how to lose."
-Finch: ”He’s been using the committee as his puppet theater.”
4) Lex fears a world run by metahuman tyrants, namely Superman.
-Lex: "Every other Saturday [my father] had to march in a parade and wave flowers at tyrants"....”Why would we want to weaponize this material?” ”As a deterrent. A silver bullet to keep in reserve to use against the Kryptonians so that the day does not come madam when your children are waving daisies at a reviewing stand.”
-Lex: "Homeland security? No, no, no, no madam, Planetary Security"
-Lex: ”The problem of you on top of everything else. You above all.”
-Lex: ”If god is all powerful, he cannot be all good. And if he is all good, he cannot be all powerful.”
-Lex: "Devil's don't come from Hell beneath us. No, they come from the sky."
-Lex: "You know the oldest lie in America, senator? It's that power can be innocent."
5) Lex plans to prove the world has reason to fear metahuman tyrants such as Superman (in part by exposing that "power can be innocent" is a lie)
-Lex’s “silver bullet” is dismissed because no one believes him that there are others with powers like Superman to fear.
Senator: “Last I looked the only one of those flying around up here was Superman.”
Lex: “Haha, yes, Superman. Yeah, but there are uh, there are more of them.
Finch: “The metahuman thesis.”
Lex: “Yes, the metahuman thesis. More likely than not these exceptional beings live among us. The basis of our myths. God among men upon our little blue planet here."
-Lex: ”...if Man won’t kill God, the devil will do it.” Lex acknowledges that Superman is viewed as a god by the people, and that Doomsday would be viewed as a devil. The world views devils as bad and that they must be stopped. By unleashing Doomsday, Lex is giving the world a devil of Kryptonian origin to justify his silver bullet, to justify the need for such a thing. Something that he has personally been pushing for openly.
-Lex unleashes Doomsday with full knowledge that Batman has the Kryptonite which could be used to defeat Doomsday. And it’s very likely he even knows Batman created a spear from surveilling him. In any case, Lex has made it known that he has the means to create a kryptonite weapon and the government would follow the yellow brick road back to him.
-Lex: They need to see the fraud that you are. With their eyes. The blood on your hands. And tonight they will." Lex hopes and expects Batman to kill Superman. If Batman fails and Superman kills him, Lex exposes Superman as an evil fraud with blood on his hands and proves there is reason to fear him and to put an end to him. If Batman succeeds and kills Superman, Lex is allowed to spin a tale of Superman unleashing his Doomsday into the world framing him as an evil fraud with blood on his hands that Batman was forced to kill. Superman would not be alive to defend himself or to expose Lex as the puppet master.