I believe the distinction is usually criminal vs non criminal charges usually. Most criminal things require you to have intended to do the bad thing. That doesn't mean that you intended the outcome, just the act that caused it.
If you intentionally kill someone: murder. If you intentionally attack someone and they die: a lesser type of murder. If you deliberately decide to not maintain some tall thing and it falls and kills someone: negligent manslaughter.
If you're on a construction site using a nail gun and you follow your training and check what's behind stuff and put up rope to keep people out of where you can't see and a nail misses a stud and hits someone killing them: tragic accident. You didn't intentionally do anything wrong.
For civil things they can often just argue that you caused harm, so you're responsible for some portion of it. That usually doesn't apply to retail theft because "left with paper towel unpaid, we stopped them and took back the paper towel" doesn't actually have any harm. There's nothing to fix.
While there's definitely dick baggery in retail theft prevention and store security, I have my doubts that the people complaining here about it at the self checkout are actually the victims of it.