A presupposition of confession is that you have contrition and the resolve not to sin and wish to receive absolution (which doesn't remove the need for temporal justice btw). Premeditation and without remorse turns that confession into an empty act, and indeed, another sin.
Calvinists also believe in confession. Indeed, it doesn't even require the uncomfortable encounter with a priest. You can just do it privately in their view.
This touches on the purpose of sacraments in the Catholic Church. They are meant to be visible signs that give assurance and certainty that something has taken place. If a human being were to show perfect contrition (very rare), then there is no need for the confessional (and ultimately, God is not bound by the sacraments). But for the penitent, the confessional gives assurance of absolution, provided there is some measure of requisite contrition. You don't have to wonder about your eternal fate after leaving the confessional.
The idea that Catholic societies are corrupt or and Calvinist societies are tidy and ordered is a stereotype, and it is silly and ahistorical to claim that you need authoritarianism to bring order to Catholic countries. Catholic societies have a greater tolerance for the messiness of human life. It views itself like a field hospital ready to provide people with means to get back up and to heal. Calvinists, on the other hand, are strangled by their constant anxiety about whether they are part of the elect or not. That can translate into rigidity, rigorism, scrupulosity, and OCD. These, in turn, can resort in a backlash of moral laxity.
(Another stereotype is the Protestant work ethic. Apparently, no one ever heard of the Benedictines and their influence on Europe. There is also a healthy attitude toward work and an unhealthy one.)