Supposedly, the reason given was that that including burglars in the game was a cultural faux-pas in China, thus they couldn't include it. A "T" rating game that seems like it's made for five-year-olds in how it seems to avoid everything that could possibly be controversial, or "bad or dangerous" as it was said before.
All the suggestions mentioned here sound great! Now, if only the development team is paying attention... I don't think it would be too difficult to add into the Get to Work EP; mainly because police and their career outfits (as well as prison jumpsuits for criminals) already exist in this EP. When you're on the beat (or "On Patrol" as the game says), catching robbers in the act (among other crimes) would be one thing to break the monotony of that career in-game. The same goes for firefighters. I'd like to see that as a career as well. As an active career as is already in TS3:Ambitions, I think that's just wishful thinking.