Question

In the question below, the Rabbi was asked about punishing someone who violated basic morality even if there is no law covering it.
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 legal justification.
Is the Rabbi disputing the obligation of due process?
Don't you think it is worth preserving the purity of justice even at the cost of letting villains go free?