-He's actually a sucker for romance. He likes putting on grandiose displays of affection.

-His mother murdered his infant baby brother, so that he wouldn't be subject to the same cruel parenting by Lionel that Lex was.

-Lex had his baby brother cloned and ages up to an adult. Repeatedly. But each time the clones misbehaved and he had them killed. He eventually gave up on the project.

-He genuinely believes that the morality of this crew is holding them back. You can't half-ass it in a war.