Question

In the question below, the Rabbi was asked about punishing a person who violated basic morality even when there is no law.
https://mikyab.net/%D7%A9%D7%95%D7%AA/%D7%AA%D7%95%D7%A7%D7%A4%D7%95-%D7%A9%D7%9C-%D7%94%D7%97%D7%95%D7%A7-%D7%94%D7%98%D7%91%D7%A2%D7%99/
The Rabbi wrote that he supports punishing “those who deserve it” even without formal justification.
Is the Rabbi disputing the obligation of due process?
Don’t you think it is worth preserving the integrity of justice even at the cost of letting villains go free?