You realize how _high_ that ratio is if taken literally: almost 10% of people found guilty will be innocent.

In practice, the west probably does more like 1% or 0.1%; El Salvador has released ~6% of those arrested. Though that figure also includes plea deals, and cases where people argued for clemency. And they're probably incorrectly releasing people who are in fact gang members too.

These kinds of numbers are easily justified when you take into account the fact that criminals repeatedly commit crimes. In the case of El Salvador, literally hundreds of lives per year are being saved, and an entire country is being transformed for the better.