Question

In the question below, Rabbi Michael Abraham 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 challenging 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?