Question

In the question below, the Rabbi was asked about punishing a person who violated basic morality even in the absence of a 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 preferable to preserve the integrity of justice even at the price of letting scoundrels go free?