You can't. There will definitely be mistakes in a revolution that is strapped for resources, fighting a civil war, lacks the capacity to imprison and guard the sheer quantity of prisoners, etc etc. The political realities of that situation are that things will definitely not be perfect.

This is an uncomfortable truth but one revolutionaries have to come to terms with. It's not a desirable outcome but is going to occur during the conditions of those events. You do your best with what you have in what will essentially be a war.