It's perfectly possible to be a heroin addict and an upstanding citizen at the same time. The same cannot be said of a bike thief. The vast majority of even hardcore homeless drug addicts do not engage in malicious property crimes. It's only a small fraction, that also tends to be the most violent and socially pathological.
Vigorous enforcement of property crime improves the life for everyone in the city. Doubly so for the otherwise law-abiding drug users, who most often bear the worse brunt of the anti-social property criminals. The best way to sell drug policy reform to law and order conservatives is to redirect those resources to non-victimless crimes. Not just throw your hands up in the air and give up on enforcing any laws whatsoever.