Duterte appeals to the large segment of the Philippine population that is fed up with rampant drug use, so he’s set off a pogrom of systematic, extra-judicial killings of drug users/sellers. You might be interested in my take on Trump voters here:

The White People Crisis

As for your comment on Western society, it’s hard to disagree. The backlash in Europe against migrants is a clear case in point, and one doesn’t need to dig deep to see the motive you describe.