Rogue Modrons and Souls

A modron that goes rogue probably knows immediately that his link with the race has been disrupted, and that this is dangerous. It may have gone rogue while alone, on a trip away from Mechanus: this is, in fact, the most likely scenario, since modrons in the presence of other modrons or surrounded by the Clockwork Nirvana will have protections against instabilities that might cause going rogue.

One that goes rogue while on Mechanus will probably realize that it is in a dangerous spot and needs to leave if it values its own safety. If it doesn't, it won't become a player character because it's not likely to survive for long! There may be plenty of modrons who go rogue, realize this, and decide to commit a quick suicide in the hopes that their energy gets restored to the communal pool, or out of fear of doing something that would harm the cause of Order. But those aren't interesting, so we tell stories about the ones that go rogue and survive by having an exit visa, or enough money to get out, or know where a convenient portal is, or so forth.