The situation we are now in has arisen under prohibition. Prohibition means that the supply of drugs is in criminal hands. That means dubious quality and uncertain strength and roof-high prices. Poor quality can mean death. High prices mean high crime rates so that addicts can get the money.
Legalisation means a legitimate and controllable supply.
The drugs can be supplied at a fraction of the illegal market prices, quality can be assured. The result- less crime to get the money and fewer deaths from impurities. Addicts would not need to create new addicts to pay for their own habits. Users would be identifiable and offered help. Less crime, less suffering, less misery for the families.