It seems you may be reading mainly Western media. You know, the one that until recently was happy for Saudi Arabia to live by medieval values because the West dislikes Iran more and quite likes affordable oil.
Rodrigo Duterte is extremely popular in the Philippines and to understand why you need to understand the issues in the country. Western standards do not apply to a country which has poverty the West doesn't have.
Duterte used to be Mayor of Davao, which is bigger than Manila. When he got the post, Davao was described as being as lawless and crime ridden as Nicaragua. Today, Davao is in the top 10 safest places in the world.
Philippines has a huge drug problem where lives are ruined and families lives ruined. All the West reports is some crude death toll because it suits the Duterte Harry narrative. Duterte is just as well known for opening rehabilitation sites for drug users, for being supportive of LBGTQ rights, for being the first on the scene in natural disasters, for compassionately personally visiting the families of fallen soldiers, for acknowledging the abuses and plight of Overseas foreign workers, for the poor, for the repressed, for being the only one to tackle the traffic issues in Manila and the only one to recognise the drugs trade is what drags the country down.
But that doesn't suit the image the West wants to perpetuate. The killings in the Western media, how much do they make of the fact these pushers get killed because they resist arrest or attack the Police? How much is made of the rehabilitation programs? For those that die, it's usually self inflicted. They have every chance to not be in that situation and drag down an exponential amount more.
Duterte is not perfect but he gets results and gets his hands dirty where others won't. He's a man of simple means who shuns the riches of some of his predecessors. The Western media has done a great job of demonising him but for those of us who visit the country frequently and see with our own eyes his impact the Philippines is a far safer country than it was before him.