The biggest reason I think that Duterte might actually really be 'for real' and not just riding on marketing hype generated from mined social media data is the vicious attacks he gets from globalists (NGO's, United Nations, mainstream media, etc.)

My contention is that Duterte really is screwing up some long term globalist programs for The Philippines.  Especially their illicit drug operations which are meant to undermine society by corrupting government at all levels. Globalists want country's national governments  to be unstable, paralyzed, and focused on internal problems.  The more exploitable resources a country has the more important it is to control them, and The Philippines is actually fairly rich.

The interesting thing to see is that once people see that there is some possibility for things to get better when it comes to drugs and other such things, and see it happen even just a little bit, they will work vigorously to not regress and their tolerance for future problems goes way down.  At least that is what it seems like to me.

One decent person making forward progress for a brief time can undue years of hard work on the 'evil' side dragging the country toward collapse and/or revolution.  The world is full of such 'asymmetric phenomenon'.  Identifying them is key to good strategy.