People take the easier option. You choose "lock your trains well" despite knowing the answer will be "crack those locks well" because it was the easy answer. The view is simple. Eventually the train will be a rolling mountain of steel protected by an army. Your fishing lure will cost an arm and a leg because protection costs are up. And the thieves will just be relegated to do slave work (the work that shouldn't exist in those conditions but society was too busy locking the train well to bother protecting its most vulnerable members) or starve because those are the only options on the table.