A part of Lex wondered why he was even bothering to steal so many spaceship related things when he had no real need for spaceships at all. Was it just because they looked so cool?
No, he was just preparing in advance to avoid issues in the future. After all, who knew when he would need a very cool looking spaceship?
Such justifications were going through Lex's mind as he continued his looting. He was spending longer on the level with the spaceship, but that was only because harvesting the energy sources and ammunition took longer than just grabbing it. Even reaching it required going through special procedures, lest they become tainted or compromised in some way.