Solaris is a hotbed of criminal activity, so organized crime is a definite possibility, and not only do you have just one criminal organization, but each different sector could have one, causing complicated issues (You're a Lyran MW who was told by the Yak in the Kobe sector that you better win your next fight while the Mafia in the FedSuns sector said you'd better lose your next fight...)
You've also got things like spying and sabotage, maybe you're not a MW but a tech, and you've been hired to sabotage a stable's Mechs...
And if things are too peaceful, depending on when you're running the game, you can have large scale fights happening as well...