Heroin indeed unambiguously benefits heroin users.
Yes, heroin can cause addiction, but the revealed preference of heroin users is to have heroin, not freedom from addiction.
You can voluntarily stop using heroin.
(Both heroin & rent control create local optima)
Rent control is indeed unambiguously benefits tenants in rent controlled units.
Yes, units can fall into disrepair but the revealed preference of those stabilized tenants is to have cheap rent not a nicer place.
You can voluntarily leave a rent controlled unit.
(1/2)