In an interview recently he openly speculated about how long he’d be in prison if Kamala wins. It seems like he has a strong savior complex, and thinks he’s the only one that can save humanity by establishing colonies on Mars. He phrases it as preserving “the light of consciousness.” Can’t reasonably do that from prison. With that perspective, for him, practically all means justify that end.
At more personal level, after one of his kids transitioned he publicly stated it was like that kid had “died.” In his own words, he swore to kill the “woke mind virus.”
Key detail: they’re not dropping it because they’re giving up, the judge dismissed it without prejudice, which means that in 4 years they can pick the case back up. Under a Trump DoJ the case would likely have ended with prejudice, closing it permanently.