We haven't won the "war on drugs" because it isn't a "war." There is no end to it. There is no point at some future date that all drugs will vanish and all the users and dealers will surrender.
That does not mean that we should stop enforcing the laws. The "war" is actually an on-going struggle against one of society's worst sicknesses.
No, the "war" IS an expression of one of society's worst sicknesses - namely, the utopian desire to "improve" humanity.
To H*ll with it.
Do I see a parallel with at least one other undeclared, unwinnable "war?"