You need to check a calendar and see the current year - the days of Casinos' roughing up card counters is long long long gone. Might be great for your screenplay or fan fiction but doesn't match reality.
Strange that you can be so confident about this with private security when even actual police are sometimes involved in cases of excessive force, corruption, coverups. Besides, whatever your personal knowledge/experience is it can't be vast enough to prove a negative here, and only one counter example is needed.
Regardless of the year I think you might want to reconsider your overly confident notions about fiction/reality or at least the condescending tone. I don't know what is institutionalized in what places, but have been threatened by casino security. Fuck around and find out I guess
From where I stand, you'd need to show it's systematic. One single instance is not enough for me. Because your claims are general, as if they applied to many casinos.
