Former NYC Mayor, the late Ed Koch, a WWII Vet, said often on his 1990's WABC- AM Radio talk show that he believed Corporal Punishment for Crime, from low level on up, would be its only, actually effective, Deterrent.
At the time, an American youth, while visiting a Foreign Country, was facing a Public Caning, for what would be, here, a relatively minor offense.
As I recall, his basic thinking was on the order of : "Would a Person become a Drug Courier, Commit a Mugging or any other AntiSocial Act, if they knew that, if caught and convicted, they would be Caned?"
Of course, if something like this were ever to be legalized, it would most certainly be restricted for use against the Already Downtrodden, and Victimized, not against those who would Falsely Start a War, Crash the Economy or Take Bribes from Vested Interests while Cashing the Paycheck given to them by the People they are actually Pledged to Represent.
As for it being "Cruel and Unusual Punishment", the Unspoken Truth is that US Prisons have been awash in Cruel and Unusual Punishments, too numerous to even list (Prison Rape, Beatings by Guards, Solitary Confinement for Unconscionable Lengths of Time, Execution), for Generations, now.
And THAT is inflicted ONLY on a Certain Class of Citizen, by another Certain Class of Citizens, who have become far too comfortable in their capacity for doling out, what passes for, Justice in America.
I wonder, in a world of Justice as imagined by Mayor Koch, if a Coward like Roof would have ever gone as far as he did.