Richard Nixon would have been indicted - a Grand Jury was in session - had he not been pardoned by Gerald Ford.
Plenty of other countries - France, Israel, South Africa, and South Korea - have prosecuted former leaders.
Interesting that you did not address the charges, and immediately jumped to questioning the Rule of Law, and insulting large swaths of the population.
"If you have the facts on your side, pound the facts; if you have the law on your side, pound the law; if you have neither the facts nor the law, pound the table."