Corruption rises as accountability decreases and the current level of accountability for political misdeeds is all but nonexistent.
If there's no penalty, there's no incentive for doing the right thing. Political immunity has been shown to result in increased corruption. It's time for voters to demand accountability instead of immunity.
For those who will no doubt insist upon details, see "Stern School of Business assistant professor of economics Vasiliki Skreta and co-authors, Karthik Reddy of Harvard Law School and Moritz Schularick of the University of Bonn, examine statutory immunity provisions that obstruct or limit the criminal liability of politicians, and which exist throughout much of the modern democratic world."