I've never been incarcerated, either. But I have spent a lot of time in jail, teaching inmates.
Lessons I've learned:
The food absolutely sucks.
The health care is rudimentary at best.
Everything smells of body odor, dirty hair, and nasty food.
Hearing multiple doors lock behind you on the way in is crushing. And seeing multiple doors open for you on your way out is exhilarating.
Most important:
The people with whom you have to spend every moment of every day have attitudes, habits, and standards of right and wrong that are very different than those most members here probably live by. Imagine being housed with violent gang-bangers, addicts, or sex offenders 24/7. In those environments, "situational awareness" takes on new significance. Imagine the stress of being in condition orange (or worse) 24/7.
And imagine what happens to you as you become accommodated to these surroundings.
Truly, a huge reason not to shoot unless you absolutely have to.