So much for your singapore law, over there having to firearms is a capitol offense.
The Arms Offences Act regulates firearms offences.[21] Any person who uses or attempts to use arms (Section 4) can face execution, as well as any person who uses or attempts to use arms to commit scheduled offences (Section 4A).
Trafficking in arms (Section 6) is a capital offence in Singapore. Under the Arms Offences Act, trafficking is defined as being in unlawful possession of more than two firearms.
That has no bearing on the fact that their killing of drug dealers works.
It is irrelevant to the central point; That killing drug dealers reduces drug usage and drug supply.