Anticorruption campaigns rely on a promise and ideal of rationalisation: public officials should–and will–behave in an impersonal, rule-governed, and ultimately predictable manner. So why do anticorruption drives often increase political and administrative chaos, instead of decreasing it? In this paper I address this puzzle by analysing the simultaneous effects of judicial anticorruption on both the legislative and judicial spheres. Using the case of Romania from 2005 to 2020, I first demonstrate that the successful drive to jail corruption politicians has increased legislative instability by causing waves of party switching, thereby perforating the political opportunity structure and making space for new, populist political parties. I then show how the new structures of judicial anticorruption have fractured the career lines of judges and prosecutors, while at the same time giving magistrates a reason to weaponise their growing professional heterogeneity as they struggle for control over the new and scarce professional resources brought by the anticorruption drive. This increasing complexity in both legislative and judicial spheres results in ever-growing discursive commitment to rule-following coupled with a decreasing ability to actually follow those rules as the set of veto players becomes increasingly unstable, an outcome that, following institutional theorists in sociology, I term “decoupled rationalisation.”