SBWUY Episode 122 Operation Midnight Climax

This episode I look into Operation Midnight Climax, a CIA funded prostitution ring that involved drugging unsuspecting Johns with LSD and trying to get intel from them after sex. The operation ran for 10 years and operated in 2 cities but all information on the program was destroyed. Why did the CIA choose its own citizens to test this program on? Or more importantly, why did the CIA go unpunished after all the facts were revealed?