This is not as simple matter as it seems.

Duterte, being already of age when he took the presidency, openly said that ''he is an old guy who has only this one shot to set things right'' before he is out of the picture (and thrown under the train).

And so the war on drugs begun. Philippines are the country of almost 100 million people and the drug world there is ruled by chinese. So one could imagine how Duterte pissed of many ''influential'' chinese. Furthermore, he did allow for controversial law to shoot any drug abusers on site, because this went on to allow every corrupt police officer/official to shoot his snitch (generally either drug user or member of the drug world) in order to protect their own corrupt asses (by shutting the mouth of possible witness).

Things very quickly spiraled out of control and pretty soon it was difficult to hold the reins (although he managed... somehow), however, this also DID efficiently decimate the drug world and chinese influence in Philippines.

I'm not getting into other affairs of his here, but this one is really complex and not to be judged hastily.

On a further note, ICC should not be blowing it's own pipes on Duterte case. Mongolia, for example, did not touch Putin, who really IS a deranged war criminal and mafia kingpin, so there are obviously... people that are ''above the system''. 80 year old Philippine president is, what Klingons would call: not honorable prey.

Crime does not get old and this is, for sure, a good thing. But one should not rush in judgement and know that here is a lot more than meets the eye.