It may be true that a lighter stance on drugs will result in safer streets, less trafficking, more tax revenue and many other upsides, but at this point in the conversation, it's going to be impossible to sell that idea to voters. That means no politician will back such a plan, because it will mean the end of their career, even if it's the right thing to do. It might not be, but the point is that it would go against the politician's best interests to do the unpopular thing.
Mokalus of Borg
PS - Leadership is doing what's right, even when it's unpopular.
PPS - Politics is doing what's popular, even when it's wrong.