If I came down in my magic spaceship and made all the walls of some MAJOR prison vanish then here is what that would look like: Blood everywhere, prosoners being shot, other prisoners mobbing guards and getting their guns and killing the guards, more prisoners being shot, more prisoners shooting, finally most unarmed and armed guards not risking their lives by chasing the escapees in the midst of this bloody massacre but declaring a statewide emergency in which the national guard would be called out and helicopters would be deployed to search for the many escapees, who have dispersed quickly in the wilderness and thus won't be easy to find, even when those extra skilled forces in black- the sniper/ninja level guys get involved and are looking at the ground from aircraft. There would be hundreds of local residents in danger. Some of the prisoners are good people and made a mistake that landed them in prison, others are repeat offenders who want to rape your loved ones and kill your dog, your neighbor, your father, and your son so he can steal a car, guns, and some money. Some will take hostages. When animals go wild would have nothing on when herds of escaped felons go wild. They would vastly outnumber any team of prison guards. Many on both sides would die. Sorry. What was your question? Oh. Why don't you go ask the prisoners what they think. They'll laugh at you if you suggest they couldn't overpower the guards in the event the walls and fences all suddenly vanished. You could even go ask a guard. An honest one, not a cocky one. Poisoners are real people with wills and incentives to be free and you ask this like they're paper-dolls.