This extreme policy also comes with an amnesty program if you surrender to police, with rehab, work and welfare. It's how he cleaned up Davao by disappearing gangsters and offering the ones left this olive branch program.
China and Indonesia dissappear thousands of addicts and criminals every year too the only difference is it's not advertised in the media as a killing free for all. This guy also gave Indonesia the green light to go after Abu Sayyaf kidnappers basically inviting them to invade those autonomous islands.