There was no major drug plague in the Philippines. And many of these "drug dealers" happened to be Duterte's political opponents.
He is a dictator, seizing power slowly. He is also about to declare martial law over all the islands (not just a few, where it is now), for NO REASON except to give him emergency powers to jail - and brazenly kill - anyone he wants.
You don't have to play the part of Trump's lawyer on here, for godsake.