And that is entirely appropriate. Not doing your job properly is not a crime, but may be a subject for disciplinary action. Anyone who actually knew what was going on, and didn't either stop it or report it up the chain of command, is an accessory to the crime, if crime there be of course, and is subject to criminal penalties.
The General Colonel failed to do her job properly. Pfc. Lynndie England's sperm donor committed a crime by ordering those under him to commit one. (Again, if crime there be). The underlings who obeyed those orders probably committed a crime also, but if it was not completely clear that it was a crime, then they were only guilty of ignorance, because enlisted personnel must obey orders unless they know them to be illegal.
No true. Karpinski was a commanding officer, and could have been court-martialed under at least 3 of the punitive articles of the UCMJ. I sense that she struck a deal, which ultimately kept others out of the limelight.