Isn’t that a good thing? Doesn’t that imply the existence of a functioning criminal justice system that does not apply special treatment to someone just because they hold high office?
Disclaimer: I know nothing about Peruvian politics. But it could just mean each new administration jails and prosecutes the former administration.
I mean at some point you would hope that someone that is not a criminal would hold the office.
With that level of corruption I'm not sure I'd be so trusting their is a "functioning justice system" just because it's locking important people away - it could be a sign of the exact opposite.
When you always feel the need to lock up the last guy it doesn't exactly scream "peaceful transition of power".
It doesn't encourage the peaceful transition of power, either. If I'm the sitting president, and I know that the next one will lock me up, why should I hand over power to him peacefully?
Maybe it _also_ means they did things beyond the pale, so there was little choice but to prosecute.