Probably because it would be a massive cost, on the level of a nationwide program to eliminate homelessness. And the portugal model doesn't seem to really wean

Probably because it would be a massive cost, on the level of a nationwide program to eliminate homelessness. And the portugal model doesn't seem to really wean people off drugs, unlike homelessness, so it's just endless money being funneled into maintaining addicts, which in time will keep growing since drug use is legal. We'd probably run out of money if we tried.