I think I see where the discussion frequently diverges on these threads - you're pointing out that incarceration does not appear to decrease offenses, while myself and others are pointing out why more incarceration is an outcome (desired, if we're being opinionated) of more offenses.
I think you're onto something in calling your point out, but at the same time, it's daring commenters to ask you what any society's response to crimes should be.
Rather than be coy, I'll stick my neck out and claim incarceration is about optimizing for outcomes among the peaceful/orderly middle and higher classes. We don't have to worry about the philosophical question of why crime occurs, or whether incarceration will work overall, it works well enough to deflect crimes away from certain locally policed areas and demographics and that flawed approach is good enough to keep the unkind, leaky system going.