That alleged right of criminals to be persecuted in strictly descending order of severity simply does not exist. Finding some bigger wrong does not make a right.
Are there any societies, historical or current, where the extremely rich and powerful face justice in the way you would like, other than by pissing off other extremely rich and powerful people?
I did wonder whether I should include 'western' or not. I probably shouldn't have, since, I agree with your point, it's not a area that distinguishes western from non-western.