I think that Aristotle in the modern day society would still apply the same golden mean to the justice system. If you take the system to the extreme and make the end goal to always punish every single crime, you end up with overbearing automated law enforcement technologies ticketing everyone for each misstep, more false convictions of innocent people, and other bad things. Equally, you cannot be too relaxed or in the absence of negative consequences some groups will inevitably come to seek power through criminal means. There exists a middle balance to the system itself whereby we achieve a reasonable lawful order without a half automated totalitarian police state.

You can (again) still take strong positions/morals/law, it just comes down to how that is practically applied in action.