That is what I do. And for extra challenge I only put one law enforcement unit per each city. However the challenge ends by the Industrial Era, since there are plenty of buildings that decrease crime.
I think you misunderstood my "challenge".
I meant "to build nothing but Criminals and swarm everyone around you with them", loool.
But since it's basically gonna do nothing but destabilize them, it's kinda... boring.
It did give me the idea now for a "challenge" of "how to get the biggest number of encountered civilizations - by making the old ones split into new ones".
Basically:
No "One City Limit" - so they can build multiple cities. Note: I'd start with 40 Civs already, so this is for the splits that happen AFTER some initial Civ dies. Yup, lol.
No "Barbarians" - for faster turn times and for "cleaner experiment", lol. Note that Criminals still exist, and I GUESS they could turn a city into a Barb one (basically the goal of testing).
"Barbs spawn new Civs" - so the ex-Civ ex-Barb cities spawn NEW Civs, loool.
My modmod "Prehistory only" - so it's a limited tech tree, a faster game, and a funnier "experiment".
LOL! Might actually DO it now.
Also, this in no way means that MY city (or cities) would have negative Crime. The goal is to destabilize OTHERS, ya know. MWAHAHAHA!!!