He just kill all people who are involved in drug. You don't solve problems just to murder all who don't fit you ideally country in his eyes. A country without drugs don't exist it will always be part of the world.
Police do legitimate operations, yes there are some police who abuse it but they're just the exception of most good cops. Drugs suspects often fight their way out to escape raids while of course some drug lords kill their subordinates to avoid loose ends and ratting them out, in which our "UNBIASED" media oversensationalized it and put the blame on the policemen.
One of the big news agency here in the Philipines are partly owned by the opposing party.