Lawyers are hard to represent for the sole fact that this is not real life. It's much more complicated to obtain basic evidence (ex. fingerprints, gun powder, CCTV camera footage). You could say that there are some benefits ex. as you can use demos and whatnot, roleplaying them as dashcam or the sort, but even that is very limited (and really, sending demo to a lawyer or editing it would probably be a complete waste of time, spending 30 minutes in trials when the sentence is just a few minutes).
Without actual ability to obtain and present evidence, lawyer is an unnecessary job. It would be just cop's witness statement vs the suspect's statement. It would also then require a judge, otherwise nothing would stop an officer from simply rightfully (since cops can't falsely charge people anyway & if they charge someone, there's a valid reason, excluding some cases where it would probably be punishable as breach of server rules) ignoring all the defense by the lawyer.