"Duterte was President of the Philippines when Obama was President as well, and Obama let Duterte be Duterte."
That's different from inviting him to the Whitehouse. One recognizes the limits of our power, the other condones it.
"ITT: liberals, Dems, and other lefties who are willing to sever ties to one of America's strategic allies in SE Asia, because of how they handle cartel-style drug crime in their country."
If you think only cartels are being caught up in this, you are hopelessly naive. This is a modern day witch hunt without the pretense of a trial.